drivers/target/iscsi/iscsi_target.c

   1 /*******************************************************************************
   2  * This file contains main functions related to the iSCSI Target Core Driver.
   3  *
   4  * (c) Copyright 2007-2013 Datera, Inc.
   5  *
   6  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ******************************************************************************/
  18
  19 #include <linux/string.h>
  20 #include <linux/kthread.h>
  21 #include <linux/crypto.h>
  22 #include <linux/completion.h>
  23 #include <linux/module.h>
  24 #include <linux/idr.h>
  25 #include <asm/unaligned.h>
  26 #include <scsi/scsi_device.h>
  27 #include <scsi/iscsi_proto.h>
  28 #include <scsi/scsi_tcq.h>
  29 #include <target/target_core_base.h>
  30 #include <target/target_core_fabric.h>
  31 #include <target/target_core_configfs.h>
  32
  33 #include <target/iscsi/iscsi_target_core.h>
  34 #include "iscsi_target_parameters.h"
  35 #include "iscsi_target_seq_pdu_list.h"
  36 #include "iscsi_target_tq.h"
  37 #include "iscsi_target_configfs.h"
  38 #include "iscsi_target_datain_values.h"
  39 #include "iscsi_target_erl0.h"
  40 #include "iscsi_target_erl1.h"
  41 #include "iscsi_target_erl2.h"
  42 #include "iscsi_target_login.h"
  43 #include "iscsi_target_tmr.h"
  44 #include "iscsi_target_tpg.h"
  45 #include "iscsi_target_util.h"
  46 #include "iscsi_target.h"
  47 #include "iscsi_target_device.h"
  48 #include <target/iscsi/iscsi_target_stat.h>
  49
  50 #include <target/iscsi/iscsi_transport.h>
  51
  52 static LIST_HEAD(g_tiqn_list);
  53 static LIST_HEAD(g_np_list);
  54 static DEFINE_SPINLOCK(tiqn_lock);
  55 static DEFINE_MUTEX(np_lock);
  56
  57 static struct idr tiqn_idr;
  58 struct idr sess_idr;
  59 struct mutex auth_id_lock;
  60 spinlock_t sess_idr_lock;
  61
  62 struct iscsit_global *iscsit_global;
  63
  64 struct kmem_cache *lio_qr_cache;
  65 struct kmem_cache *lio_dr_cache;
  66 struct kmem_cache *lio_ooo_cache;
  67 struct kmem_cache *lio_r2t_cache;
  68
  69 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  70                         struct iscsi_scsi_req *, u32);
  71
  72 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  73 {
  74         struct iscsi_tiqn *tiqn = NULL;
  75
  76         spin_lock(&tiqn_lock);
  77         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  78                 if (!strcmp(tiqn->tiqn, buf)) {
  79
  80                         spin_lock(&tiqn->tiqn_state_lock);
  81                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  82                                 tiqn->tiqn_access_count++;
  83                                 spin_unlock(&tiqn->tiqn_state_lock);
  84                                 spin_unlock(&tiqn_lock);
  85                                 return tiqn;
  86                         }
  87                         spin_unlock(&tiqn->tiqn_state_lock);
  88                 }
  89         }
  90         spin_unlock(&tiqn_lock);
  91
  92         return NULL;
  93 }
  94
  95 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  96 {
  97         spin_lock(&tiqn->tiqn_state_lock);
  98         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  99                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
 100                 spin_unlock(&tiqn->tiqn_state_lock);
 101                 return 0;
 102         }
 103         spin_unlock(&tiqn->tiqn_state_lock);
 104
 105         return -1;
 106 }
 107
 108 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 109 {
 110         spin_lock(&tiqn->tiqn_state_lock);
 111         tiqn->tiqn_access_count--;
 112         spin_unlock(&tiqn->tiqn_state_lock);
 113 }
 114
 115 /*
 116  * Note that IQN formatting is expected to be done in userspace, and
 117  * no explict IQN format checks are done here.
 118  */
 119 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 120 {
 121         struct iscsi_tiqn *tiqn = NULL;
 122         int ret;
 123
 124         if (strlen(buf) >= ISCSI_IQN_LEN) {
 125                 pr_err("Target IQN exceeds %d bytes\n",
 126                                 ISCSI_IQN_LEN);
 127                 return ERR_PTR(-EINVAL);
 128         }
 129
 130         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 131         if (!tiqn) {
 132                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 133                 return ERR_PTR(-ENOMEM);
 134         }
 135
 136         sprintf(tiqn->tiqn, "%s", buf);
 137         INIT_LIST_HEAD(&tiqn->tiqn_list);
 138         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 139         spin_lock_init(&tiqn->tiqn_state_lock);
 140         spin_lock_init(&tiqn->tiqn_tpg_lock);
 141         spin_lock_init(&tiqn->sess_err_stats.lock);
 142         spin_lock_init(&tiqn->login_stats.lock);
 143         spin_lock_init(&tiqn->logout_stats.lock);
 144
 145         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 146
 147         idr_preload(GFP_KERNEL);
 148         spin_lock(&tiqn_lock);
 149
 150         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 151         if (ret < 0) {
 152                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 153                 spin_unlock(&tiqn_lock);
 154                 idr_preload_end();
 155                 kfree(tiqn);
 156                 return ERR_PTR(ret);
 157         }
 158         tiqn->tiqn_index = ret;
 159         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 160
 161         spin_unlock(&tiqn_lock);
 162         idr_preload_end();
 163
 164         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 165
 166         return tiqn;
 167
 168 }
 169
 170 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 171 {
 172         /*
 173          * Wait for accesses to said struct iscsi_tiqn to end.
 174          */
 175         spin_lock(&tiqn->tiqn_state_lock);
 176         while (tiqn->tiqn_access_count != 0) {
 177                 spin_unlock(&tiqn->tiqn_state_lock);
 178                 msleep(10);
 179                 spin_lock(&tiqn->tiqn_state_lock);
 180         }
 181         spin_unlock(&tiqn->tiqn_state_lock);
 182 }
 183
 184 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 185 {
 186         /*
 187          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 188          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 189          * attempts to access this struct iscsi_tiqn will fail from both transport
 190          * fabric and control code paths.
 191          */
 192         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 193                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 194                 return;
 195         }
 196
 197         iscsit_wait_for_tiqn(tiqn);
 198
 199         spin_lock(&tiqn_lock);
 200         list_del(&tiqn->tiqn_list);
 201         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 202         spin_unlock(&tiqn_lock);
 203
 204         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 205                         tiqn->tiqn);
 206         kfree(tiqn);
 207 }
 208
 209 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 210 {
 211         int ret;
 212         /*
 213          * Determine if the network portal is accepting storage traffic.
 214          */
 215         spin_lock_bh(&np->np_thread_lock);
 216         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 217                 spin_unlock_bh(&np->np_thread_lock);
 218                 return -1;
 219         }
 220         spin_unlock_bh(&np->np_thread_lock);
 221         /*
 222          * Determine if the portal group is accepting storage traffic.
 223          */
 224         spin_lock_bh(&tpg->tpg_state_lock);
 225         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 226                 spin_unlock_bh(&tpg->tpg_state_lock);
 227                 return -1;
 228         }
 229         spin_unlock_bh(&tpg->tpg_state_lock);
 230
 231         /*
 232          * Here we serialize access across the TIQN+TPG Tuple.
 233          */
 234         ret = down_interruptible(&tpg->np_login_sem);
 235         if ((ret != 0) || signal_pending(current))
 236                 return -1;
 237
 238         spin_lock_bh(&tpg->tpg_state_lock);
 239         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 240                 spin_unlock_bh(&tpg->tpg_state_lock);
 241                 up(&tpg->np_login_sem);
 242                 return -1;
 243         }
 244         spin_unlock_bh(&tpg->tpg_state_lock);
 245
 246         return 0;
 247 }
 248
 249 void iscsit_login_kref_put(struct kref *kref)
 250 {
 251         struct iscsi_tpg_np *tpg_np = container_of(kref,
 252                                 struct iscsi_tpg_np, tpg_np_kref);
 253
 254         complete(&tpg_np->tpg_np_comp);
 255 }
 256
 257 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
 258                        struct iscsi_tpg_np *tpg_np)
 259 {
 260         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 261
 262         up(&tpg->np_login_sem);
 263
 264         if (tpg_np)
 265                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 266
 267         if (tiqn)
 268                 iscsit_put_tiqn_for_login(tiqn);
 269
 270         return 0;
 271 }
 272
 273 bool iscsit_check_np_match(
 274         struct __kernel_sockaddr_storage *sockaddr,
 275         struct iscsi_np *np,
 276         int network_transport)
 277 {
 278         struct sockaddr_in *sock_in, *sock_in_e;
 279         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 280         bool ip_match = false;
 281         u16 port;
 282
 283         if (sockaddr->ss_family == AF_INET6) {
 284                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 285                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 286
 287                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 288                             &sock_in6_e->sin6_addr.in6_u,
 289                             sizeof(struct in6_addr)))
 290                         ip_match = true;
 291
 292                 port = ntohs(sock_in6->sin6_port);
 293         } else {
 294                 sock_in = (struct sockaddr_in *)sockaddr;
 295                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 296
 297                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 298                         ip_match = true;
 299
 300                 port = ntohs(sock_in->sin_port);
 301         }
 302
 303         if (ip_match && (np->np_port == port) &&
 304             (np->np_network_transport == network_transport))
 305                 return true;
 306
 307         return false;
 308 }
 309
 310 /*
 311  * Called with mutex np_lock held
 312  */
 313 static struct iscsi_np *iscsit_get_np(
 314         struct __kernel_sockaddr_storage *sockaddr,
 315         int network_transport)
 316 {
 317         struct iscsi_np *np;
 318         bool match;
 319
 320         list_for_each_entry(np, &g_np_list, np_list) {
 321                 spin_lock_bh(&np->np_thread_lock);
 322                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 323                         spin_unlock_bh(&np->np_thread_lock);
 324                         continue;
 325                 }
 326
 327                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 328                 if (match) {
 329                         /*
 330                          * Increment the np_exports reference count now to
 331                          * prevent iscsit_del_np() below from being called
 332                          * while iscsi_tpg_add_network_portal() is called.
 333                          */
 334                         np->np_exports++;
 335                         spin_unlock_bh(&np->np_thread_lock);
 336                         return np;
 337                 }
 338                 spin_unlock_bh(&np->np_thread_lock);
 339         }
 340
 341         return NULL;
 342 }
 343
 344 struct iscsi_np *iscsit_add_np(
 345         struct __kernel_sockaddr_storage *sockaddr,
 346         char *ip_str,
 347         int network_transport)
 348 {
 349         struct sockaddr_in *sock_in;
 350         struct sockaddr_in6 *sock_in6;
 351         struct iscsi_np *np;
 352         int ret;
 353
 354         mutex_lock(&np_lock);
 355
 356         /*
 357          * Locate the existing struct iscsi_np if already active..
 358          */
 359         np = iscsit_get_np(sockaddr, network_transport);
 360         if (np) {
 361                 mutex_unlock(&np_lock);
 362                 return np;
 363         }
 364
 365         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 366         if (!np) {
 367                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 368                 mutex_unlock(&np_lock);
 369                 return ERR_PTR(-ENOMEM);
 370         }
 371
 372         np->np_flags |= NPF_IP_NETWORK;
 373         if (sockaddr->ss_family == AF_INET6) {
 374                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 375                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 376                 np->np_port = ntohs(sock_in6->sin6_port);
 377         } else {
 378                 sock_in = (struct sockaddr_in *)sockaddr;
 379                 sprintf(np->np_ip, "%s", ip_str);
 380                 np->np_port = ntohs(sock_in->sin_port);
 381         }
 382
 383         np->np_network_transport = network_transport;
 384         spin_lock_init(&np->np_thread_lock);
 385         init_completion(&np->np_restart_comp);
 386         INIT_LIST_HEAD(&np->np_list);
 387
 388         ret = iscsi_target_setup_login_socket(np, sockaddr);
 389         if (ret != 0) {
 390                 kfree(np);
 391                 mutex_unlock(&np_lock);
 392                 return ERR_PTR(ret);
 393         }
 394
 395         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 396         if (IS_ERR(np->np_thread)) {
 397                 pr_err("Unable to create kthread: iscsi_np\n");
 398                 ret = PTR_ERR(np->np_thread);
 399                 kfree(np);
 400                 mutex_unlock(&np_lock);
 401                 return ERR_PTR(ret);
 402         }
 403         /*
 404          * Increment the np_exports reference count now to prevent
 405          * iscsit_del_np() below from being run while a new call to
 406          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 407          * active.  We don't need to hold np->np_thread_lock at this
 408          * point because iscsi_np has not been added to g_np_list yet.
 409          */
 410         np->np_exports = 1;
 411         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 412
 413         list_add_tail(&np->np_list, &g_np_list);
 414         mutex_unlock(&np_lock);
 415
 416         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 417                 np->np_ip, np->np_port, np->np_transport->name);
 418
 419         return np;
 420 }
 421
 422 int iscsit_reset_np_thread(
 423         struct iscsi_np *np,
 424         struct iscsi_tpg_np *tpg_np,
 425         struct iscsi_portal_group *tpg,
 426         bool shutdown)
 427 {
 428         spin_lock_bh(&np->np_thread_lock);
 429         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 430                 spin_unlock_bh(&np->np_thread_lock);
 431                 return 0;
 432         }
 433         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 434
 435         if (np->np_thread) {
 436                 spin_unlock_bh(&np->np_thread_lock);
 437                 send_sig(SIGINT, np->np_thread, 1);
 438                 wait_for_completion(&np->np_restart_comp);
 439                 spin_lock_bh(&np->np_thread_lock);
 440         }
 441         spin_unlock_bh(&np->np_thread_lock);
 442
 443         if (tpg_np && shutdown) {
 444                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 445
 446                 wait_for_completion(&tpg_np->tpg_np_comp);
 447         }
 448
 449         return 0;
 450 }
 451
 452 static void iscsit_free_np(struct iscsi_np *np)
 453 {
 454         if (np->np_socket)
 455                 sock_release(np->np_socket);
 456 }
 457
 458 int iscsit_del_np(struct iscsi_np *np)
 459 {
 460         spin_lock_bh(&np->np_thread_lock);
 461         np->np_exports--;
 462         if (np->np_exports) {
 463                 np->enabled = true;
 464                 spin_unlock_bh(&np->np_thread_lock);
 465                 return 0;
 466         }
 467         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 468         spin_unlock_bh(&np->np_thread_lock);
 469
 470         if (np->np_thread) {
 471                 /*
 472                  * We need to send the signal to wakeup Linux/Net
 473                  * which may be sleeping in sock_accept()..
 474                  */
 475                 send_sig(SIGINT, np->np_thread, 1);
 476                 kthread_stop(np->np_thread);
 477                 np->np_thread = NULL;
 478         }
 479
 480         np->np_transport->iscsit_free_np(np);
 481
 482         mutex_lock(&np_lock);
 483         list_del(&np->np_list);
 484         mutex_unlock(&np_lock);
 485
 486         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 487                 np->np_ip, np->np_port, np->np_transport->name);
 488
 489         iscsit_put_transport(np->np_transport);
 490         kfree(np);
 491         return 0;
 492 }
 493
 494 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 495 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 496
 497 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 498 {
 499         iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 500         return 0;
 501 }
 502
 503 static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 504 {
 505         bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
 506
 507         spin_lock_bh(&conn->cmd_lock);
 508         if (!list_empty(&cmd->i_conn_node))
 509                 list_del_init(&cmd->i_conn_node);
 510         spin_unlock_bh(&conn->cmd_lock);
 511
 512         __iscsit_free_cmd(cmd, scsi_cmd, true);
 513 }
 514
 515 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
 516 {
 517         return TARGET_PROT_NORMAL;
 518 }
 519
 520 static struct iscsit_transport iscsi_target_transport = {
 521         .name                   = "iSCSI/TCP",
 522         .transport_type         = ISCSI_TCP,
 523         .owner                  = NULL,
 524         .iscsit_setup_np        = iscsit_setup_np,
 525         .iscsit_accept_np       = iscsit_accept_np,
 526         .iscsit_free_np         = iscsit_free_np,
 527         .iscsit_get_login_rx    = iscsit_get_login_rx,
 528         .iscsit_put_login_tx    = iscsit_put_login_tx,
 529         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 530         .iscsit_immediate_queue = iscsit_immediate_queue,
 531         .iscsit_response_queue  = iscsit_response_queue,
 532         .iscsit_queue_data_in   = iscsit_queue_rsp,
 533         .iscsit_queue_status    = iscsit_queue_rsp,
 534         .iscsit_aborted_task    = iscsit_aborted_task,
 535         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 536 };
 537
 538 static int __init iscsi_target_init_module(void)
 539 {
 540         int ret = 0;
 541
 542         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 543
 544         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 545         if (!iscsit_global) {
 546                 pr_err("Unable to allocate memory for iscsit_global\n");
 547                 return -1;
 548         }
 549         mutex_init(&auth_id_lock);
 550         spin_lock_init(&sess_idr_lock);
 551         idr_init(&tiqn_idr);
 552         idr_init(&sess_idr);
 553
 554         ret = iscsi_target_register_configfs();
 555         if (ret < 0)
 556                 goto out;
 557
 558         ret = iscsi_thread_set_init();
 559         if (ret < 0)
 560                 goto configfs_out;
 561
 562         if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
 563                         TARGET_THREAD_SET_COUNT) {
 564                 pr_err("iscsi_allocate_thread_sets() returned"
 565                         " unexpected value!\n");
 566                 goto ts_out1;
 567         }
 568
 569         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 570                         sizeof(struct iscsi_queue_req),
 571                         __alignof__(struct iscsi_queue_req), 0, NULL);
 572         if (!lio_qr_cache) {
 573                 pr_err("nable to kmem_cache_create() for"
 574                                 " lio_qr_cache\n");
 575                 goto ts_out2;
 576         }
 577
 578         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 579                         sizeof(struct iscsi_datain_req),
 580                         __alignof__(struct iscsi_datain_req), 0, NULL);
 581         if (!lio_dr_cache) {
 582                 pr_err("Unable to kmem_cache_create() for"
 583                                 " lio_dr_cache\n");
 584                 goto qr_out;
 585         }
 586
 587         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 588                         sizeof(struct iscsi_ooo_cmdsn),
 589                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 590         if (!lio_ooo_cache) {
 591                 pr_err("Unable to kmem_cache_create() for"
 592                                 " lio_ooo_cache\n");
 593                 goto dr_out;
 594         }
 595
 596         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 597                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 598                         0, NULL);
 599         if (!lio_r2t_cache) {
 600                 pr_err("Unable to kmem_cache_create() for"
 601                                 " lio_r2t_cache\n");
 602                 goto ooo_out;
 603         }
 604
 605         iscsit_register_transport(&iscsi_target_transport);
 606
 607         if (iscsit_load_discovery_tpg() < 0)
 608                 goto r2t_out;
 609
 610         return ret;
 611 r2t_out:
 612         iscsit_unregister_transport(&iscsi_target_transport);
 613         kmem_cache_destroy(lio_r2t_cache);
 614 ooo_out:
 615         kmem_cache_destroy(lio_ooo_cache);
 616 dr_out:
 617         kmem_cache_destroy(lio_dr_cache);
 618 qr_out:
 619         kmem_cache_destroy(lio_qr_cache);
 620 ts_out2:
 621         iscsi_deallocate_thread_sets();
 622 ts_out1:
 623         iscsi_thread_set_free();
 624 configfs_out:
 625         iscsi_target_deregister_configfs();
 626 out:
 627         kfree(iscsit_global);
 628         return -ENOMEM;
 629 }
 630
 631 static void __exit iscsi_target_cleanup_module(void)
 632 {
 633         iscsi_deallocate_thread_sets();
 634         iscsi_thread_set_free();
 635         iscsit_release_discovery_tpg();
 636         iscsit_unregister_transport(&iscsi_target_transport);
 637         kmem_cache_destroy(lio_qr_cache);
 638         kmem_cache_destroy(lio_dr_cache);
 639         kmem_cache_destroy(lio_ooo_cache);
 640         kmem_cache_destroy(lio_r2t_cache);
 641
 642         iscsi_target_deregister_configfs();
 643
 644         kfree(iscsit_global);
 645 }
 646
 647 static int iscsit_add_reject(
 648         struct iscsi_conn *conn,
 649         u8 reason,
 650         unsigned char *buf)
 651 {
 652         struct iscsi_cmd *cmd;
 653
 654         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 655         if (!cmd)
 656                 return -1;
 657
 658         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 659         cmd->reject_reason = reason;
 660
 661         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 662         if (!cmd->buf_ptr) {
 663                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 664                 iscsit_free_cmd(cmd, false);
 665                 return -1;
 666         }
 667
 668         spin_lock_bh(&conn->cmd_lock);
 669         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 670         spin_unlock_bh(&conn->cmd_lock);
 671
 672         cmd->i_state = ISTATE_SEND_REJECT;
 673         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 674
 675         return -1;
 676 }
 677
 678 static int iscsit_add_reject_from_cmd(
 679         struct iscsi_cmd *cmd,
 680         u8 reason,
 681         bool add_to_conn,
 682         unsigned char *buf)
 683 {
 684         struct iscsi_conn *conn;
 685
 686         if (!cmd->conn) {
 687                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 688                                 cmd->init_task_tag);
 689                 return -1;
 690         }
 691         conn = cmd->conn;
 692
 693         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 694         cmd->reject_reason = reason;
 695
 696         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 697         if (!cmd->buf_ptr) {
 698                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 699                 iscsit_free_cmd(cmd, false);
 700                 return -1;
 701         }
 702
 703         if (add_to_conn) {
 704                 spin_lock_bh(&conn->cmd_lock);
 705                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 706                 spin_unlock_bh(&conn->cmd_lock);
 707         }
 708
 709         cmd->i_state = ISTATE_SEND_REJECT;
 710         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 711         /*
 712          * Perform the kref_put now if se_cmd has already been setup by
 713          * scsit_setup_scsi_cmd()
 714          */
 715         if (cmd->se_cmd.se_tfo != NULL) {
 716                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 717                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
 718         }
 719         return -1;
 720 }
 721
 722 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 723                                  unsigned char *buf)
 724 {
 725         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 726 }
 727
 728 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 729 {
 730         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 731 }
 732
 733 /*
 734  * Map some portion of the allocated scatterlist to an iovec, suitable for
 735  * kernel sockets to copy data in/out.
 736  */
 737 static int iscsit_map_iovec(
 738         struct iscsi_cmd *cmd,
 739         struct kvec *iov,
 740         u32 data_offset,
 741         u32 data_length)
 742 {
 743         u32 i = 0;
 744         struct scatterlist *sg;
 745         unsigned int page_off;
 746
 747         /*
 748          * We know each entry in t_data_sg contains a page.
 749          */
 750         sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
 751         page_off = (data_offset % PAGE_SIZE);
 752
 753         cmd->first_data_sg = sg;
 754         cmd->first_data_sg_off = page_off;
 755
 756         while (data_length) {
 757                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 758
 759                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 760                 iov[i].iov_len = cur_len;
 761
 762                 data_length -= cur_len;
 763                 page_off = 0;
 764                 sg = sg_next(sg);
 765                 i++;
 766         }
 767
 768         cmd->kmapped_nents = i;
 769
 770         return i;
 771 }
 772
 773 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 774 {
 775         u32 i;
 776         struct scatterlist *sg;
 777
 778         sg = cmd->first_data_sg;
 779
 780         for (i = 0; i < cmd->kmapped_nents; i++)
 781                 kunmap(sg_page(&sg[i]));
 782 }
 783
 784 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 785 {
 786         LIST_HEAD(ack_list);
 787         struct iscsi_cmd *cmd, *cmd_p;
 788
 789         conn->exp_statsn = exp_statsn;
 790
 791         if (conn->sess->sess_ops->RDMAExtensions)
 792                 return;
 793
 794         spin_lock_bh(&conn->cmd_lock);
 795         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 796                 spin_lock(&cmd->istate_lock);
 797                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 798                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 799                         cmd->i_state = ISTATE_REMOVE;
 800                         spin_unlock(&cmd->istate_lock);
 801                         list_move_tail(&cmd->i_conn_node, &ack_list);
 802                         continue;
 803                 }
 804                 spin_unlock(&cmd->istate_lock);
 805         }
 806         spin_unlock_bh(&conn->cmd_lock);
 807
 808         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 809                 list_del_init(&cmd->i_conn_node);
 810                 iscsit_free_cmd(cmd, false);
 811         }
 812 }
 813
 814 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 815 {
 816         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 817
 818         iov_count += ISCSI_IOV_DATA_BUFFER;
 819
 820         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 821         if (!cmd->iov_data) {
 822                 pr_err("Unable to allocate cmd->iov_data\n");
 823                 return -ENOMEM;
 824         }
 825
 826         cmd->orig_iov_data_count = iov_count;
 827         return 0;
 828 }
 829
 830 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 831                           unsigned char *buf)
 832 {
 833         int data_direction, payload_length;
 834         struct iscsi_scsi_req *hdr;
 835         int iscsi_task_attr;
 836         int sam_task_attr;
 837
 838         atomic_long_inc(&conn->sess->cmd_pdus);
 839
 840         hdr                     = (struct iscsi_scsi_req *) buf;
 841         payload_length          = ntoh24(hdr->dlength);
 842
 843         /* FIXME; Add checks for AdditionalHeaderSegment */
 844
 845         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 846             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 847                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 848                                 " not set. Bad iSCSI Initiator.\n");
 849                 return iscsit_add_reject_cmd(cmd,
 850                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 851         }
 852
 853         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 854              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 855                 /*
 856                  * From RFC-3720 Section 10.3.1:
 857                  *
 858                  * "Either or both of R and W MAY be 1 when either the
 859                  *  Expected Data Transfer Length and/or Bidirectional Read
 860                  *  Expected Data Transfer Length are 0"
 861                  *
 862                  * For this case, go ahead and clear the unnecssary bits
 863                  * to avoid any confusion with ->data_direction.
 864                  */
 865                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 866                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 867
 868                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 869                         " set when Expected Data Transfer Length is 0 for"
 870                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
 871         }
 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_cmd(cmd,
 879                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 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_cmd(cmd,
 886                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 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_cmd(cmd,
 893                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 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_cmd(cmd,
 900                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 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_cmd(cmd,
 909                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 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_cmd(cmd,
 917                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 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_cmd(cmd,
 925                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 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_cmd(cmd,
 933                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 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 = TCM_SIMPLE_TAG;
 948         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
 949                 sam_task_attr = TCM_ORDERED_TAG;
 950         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
 951                 sam_task_attr = TCM_HEAD_TAG;
 952         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
 953                 sam_task_attr = TCM_ACA_TAG;
 954         else {
 955                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
 956                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
 957                 sam_task_attr = TCM_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                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
 972         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 973                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 974         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
 975         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
 976         cmd->first_burst_len    = payload_length;
 977
 978         if (!conn->sess->sess_ops->RDMAExtensions &&
 979              cmd->data_direction == DMA_FROM_DEVICE) {
 980                 struct iscsi_datain_req *dr;
 981
 982                 dr = iscsit_allocate_datain_req();
 983                 if (!dr)
 984                         return iscsit_add_reject_cmd(cmd,
 985                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
 986
 987                 iscsit_attach_datain_req(cmd, dr);
 988         }
 989
 990         /*
 991          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 992          */
 993         transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
 994                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
 995                         cmd->data_direction, sam_task_attr,
 996                         cmd->sense_buffer + 2);
 997
 998         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
 999                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1000                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1001                 conn->cid);
1002
1003         target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1004
1005         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1006                                                      scsilun_to_int(&hdr->lun));
1007         if (cmd->sense_reason)
1008                 goto attach_cmd;
1009
1010         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1011         if (cmd->sense_reason) {
1012                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1013                         return iscsit_add_reject_cmd(cmd,
1014                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1015                 }
1016
1017                 goto attach_cmd;
1018         }
1019
1020         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1021                 return iscsit_add_reject_cmd(cmd,
1022                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1023         }
1024
1025 attach_cmd:
1026         spin_lock_bh(&conn->cmd_lock);
1027         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1028         spin_unlock_bh(&conn->cmd_lock);
1029         /*
1030          * Check if we need to delay processing because of ALUA
1031          * Active/NonOptimized primary access state..
1032          */
1033         core_alua_check_nonop_delay(&cmd->se_cmd);
1034
1035         return 0;
1036 }
1037 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1038
1039 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1040 {
1041         iscsit_set_dataout_sequence_values(cmd);
1042
1043         spin_lock_bh(&cmd->dataout_timeout_lock);
1044         iscsit_start_dataout_timer(cmd, cmd->conn);
1045         spin_unlock_bh(&cmd->dataout_timeout_lock);
1046 }
1047 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1048
1049 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1050                             struct iscsi_scsi_req *hdr)
1051 {
1052         int cmdsn_ret = 0;
1053         /*
1054          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1055          * the Immediate Bit is not set, and no Immediate
1056          * Data is attached.
1057          *
1058          * A PDU/CmdSN carrying Immediate Data can only
1059          * be processed after the DataCRC has passed.
1060          * If the DataCRC fails, the CmdSN MUST NOT
1061          * be acknowledged. (See below)
1062          */
1063         if (!cmd->immediate_data) {
1064                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1065                                         (unsigned char *)hdr, hdr->cmdsn);
1066                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1067                         return -1;
1068                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1069                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1070                         return 0;
1071                 }
1072         }
1073
1074         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1075
1076         /*
1077          * If no Immediate Data is attached, it's OK to return now.
1078          */
1079         if (!cmd->immediate_data) {
1080                 if (!cmd->sense_reason && cmd->unsolicited_data)
1081                         iscsit_set_unsoliticed_dataout(cmd);
1082                 if (!cmd->sense_reason)
1083                         return 0;
1084
1085                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1086                 return 0;
1087         }
1088
1089         /*
1090          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1091          * execution.  These exceptions are processed in CmdSN order using
1092          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1093          */
1094         if (cmd->sense_reason) {
1095                 if (cmd->reject_reason)
1096                         return 0;
1097
1098                 return 1;
1099         }
1100         /*
1101          * Call directly into transport_generic_new_cmd() to perform
1102          * the backend memory allocation.
1103          */
1104         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1105         if (cmd->sense_reason)
1106                 return 1;
1107
1108         return 0;
1109 }
1110 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1111
1112 static int
1113 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1114                           bool dump_payload)
1115 {
1116         struct iscsi_conn *conn = cmd->conn;
1117         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1118         /*
1119          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1120          */
1121         if (dump_payload)
1122                 goto after_immediate_data;
1123
1124         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1125                                         cmd->first_burst_len);
1126 after_immediate_data:
1127         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1128                 /*
1129                  * A PDU/CmdSN carrying Immediate Data passed
1130                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1131                  * Immediate Bit is not set.
1132                  */
1133                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1134                                         (unsigned char *)hdr, hdr->cmdsn);
1135                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1136                         return -1;
1137
1138                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1139                         int rc;
1140
1141                         rc = iscsit_dump_data_payload(cmd->conn,
1142                                                       cmd->first_burst_len, 1);
1143                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1144                         return rc;
1145                 } else if (cmd->unsolicited_data)
1146                         iscsit_set_unsoliticed_dataout(cmd);
1147
1148         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1149                 /*
1150                  * Immediate Data failed DataCRC and ERL>=1,
1151                  * silently drop this PDU and let the initiator
1152                  * plug the CmdSN gap.
1153                  *
1154                  * FIXME: Send Unsolicited NOPIN with reserved
1155                  * TTT here to help the initiator figure out
1156                  * the missing CmdSN, although they should be
1157                  * intelligent enough to determine the missing
1158                  * CmdSN and issue a retry to plug the sequence.
1159                  */
1160                 cmd->i_state = ISTATE_REMOVE;
1161                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1162         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1163                 return -1;
1164
1165         return 0;
1166 }
1167
1168 static int
1169 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1170                            unsigned char *buf)
1171 {
1172         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1173         int rc, immed_data;
1174         bool dump_payload = false;
1175
1176         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1177         if (rc < 0)
1178                 return 0;
1179         /*
1180          * Allocation iovecs needed for struct socket operations for
1181          * traditional iSCSI block I/O.
1182          */
1183         if (iscsit_allocate_iovecs(cmd) < 0) {
1184                 return iscsit_reject_cmd(cmd,
1185                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1186         }
1187         immed_data = cmd->immediate_data;
1188
1189         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1190         if (rc < 0)
1191                 return rc;
1192         else if (rc > 0)
1193                 dump_payload = true;
1194
1195         if (!immed_data)
1196                 return 0;
1197
1198         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1199 }
1200
1201 static u32 iscsit_do_crypto_hash_sg(
1202         struct hash_desc *hash,
1203         struct iscsi_cmd *cmd,
1204         u32 data_offset,
1205         u32 data_length,
1206         u32 padding,
1207         u8 *pad_bytes)
1208 {
1209         u32 data_crc;
1210         u32 i;
1211         struct scatterlist *sg;
1212         unsigned int page_off;
1213
1214         crypto_hash_init(hash);
1215
1216         sg = cmd->first_data_sg;
1217         page_off = cmd->first_data_sg_off;
1218
1219         i = 0;
1220         while (data_length) {
1221                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1222
1223                 crypto_hash_update(hash, &sg[i], cur_len);
1224
1225                 data_length -= cur_len;
1226                 page_off = 0;
1227                 i++;
1228         }
1229
1230         if (padding) {
1231                 struct scatterlist pad_sg;
1232
1233                 sg_init_one(&pad_sg, pad_bytes, padding);
1234                 crypto_hash_update(hash, &pad_sg, padding);
1235         }
1236         crypto_hash_final(hash, (u8 *) &data_crc);
1237
1238         return data_crc;
1239 }
1240
1241 static void iscsit_do_crypto_hash_buf(
1242         struct hash_desc *hash,
1243         const void *buf,
1244         u32 payload_length,
1245         u32 padding,
1246         u8 *pad_bytes,
1247         u8 *data_crc)
1248 {
1249         struct scatterlist sg;
1250
1251         crypto_hash_init(hash);
1252
1253         sg_init_one(&sg, buf, payload_length);
1254         crypto_hash_update(hash, &sg, payload_length);
1255
1256         if (padding) {
1257                 sg_init_one(&sg, pad_bytes, padding);
1258                 crypto_hash_update(hash, &sg, padding);
1259         }
1260         crypto_hash_final(hash, data_crc);
1261 }
1262
1263 int
1264 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1265                           struct iscsi_cmd **out_cmd)
1266 {
1267         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1268         struct iscsi_cmd *cmd = NULL;
1269         struct se_cmd *se_cmd;
1270         u32 payload_length = ntoh24(hdr->dlength);
1271         int rc;
1272
1273         if (!payload_length) {
1274                 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1275                 return 0;
1276         }
1277
1278         /* iSCSI write */
1279         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1280
1281         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1282                 pr_err("DataSegmentLength: %u is greater than"
1283                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1284                         conn->conn_ops->MaxXmitDataSegmentLength);
1285                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1286                                          buf);
1287         }
1288
1289         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1290                         payload_length);
1291         if (!cmd)
1292                 return 0;
1293
1294         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1295                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1296                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1297                 payload_length, conn->cid);
1298
1299         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1300                 pr_err("Command ITT: 0x%08x received DataOUT after"
1301                         " last DataOUT received, dumping payload\n",
1302                         cmd->init_task_tag);
1303                 return iscsit_dump_data_payload(conn, payload_length, 1);
1304         }
1305
1306         if (cmd->data_direction != DMA_TO_DEVICE) {
1307                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1308                         " NON-WRITE command.\n", cmd->init_task_tag);
1309                 return iscsit_dump_data_payload(conn, payload_length, 1);
1310         }
1311         se_cmd = &cmd->se_cmd;
1312         iscsit_mod_dataout_timer(cmd);
1313
1314         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1315                 pr_err("DataOut Offset: %u, Length %u greater than"
1316                         " iSCSI Command EDTL %u, protocol error.\n",
1317                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1318                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1319         }
1320
1321         if (cmd->unsolicited_data) {
1322                 int dump_unsolicited_data = 0;
1323
1324                 if (conn->sess->sess_ops->InitialR2T) {
1325                         pr_err("Received unexpected unsolicited data"
1326                                 " while InitialR2T=Yes, protocol error.\n");
1327                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1328                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1329                         return -1;
1330                 }
1331                 /*
1332                  * Special case for dealing with Unsolicited DataOUT
1333                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1334                  * failures;
1335                  */
1336
1337                 /* Something's amiss if we're not in WRITE_PENDING state... */
1338                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1339                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1340                         dump_unsolicited_data = 1;
1341
1342                 if (dump_unsolicited_data) {
1343                         /*
1344                          * Check if a delayed TASK_ABORTED status needs to
1345                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1346                          * received with the unsolicitied data out.
1347                          */
1348                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1349                                 iscsit_stop_dataout_timer(cmd);
1350
1351                         transport_check_aborted_status(se_cmd,
1352                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1353                         return iscsit_dump_data_payload(conn, payload_length, 1);
1354                 }
1355         } else {
1356                 /*
1357                  * For the normal solicited data path:
1358                  *
1359                  * Check for a delayed TASK_ABORTED status and dump any
1360                  * incoming data out payload if one exists.  Also, when the
1361                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1362                  * data out sequence, we decrement outstanding_r2ts.  Once
1363                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1364                  * TASK_ABORTED status.
1365                  */
1366                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1367                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1368                                 if (--cmd->outstanding_r2ts < 1) {
1369                                         iscsit_stop_dataout_timer(cmd);
1370                                         transport_check_aborted_status(
1371                                                         se_cmd, 1);
1372                                 }
1373
1374                         return iscsit_dump_data_payload(conn, payload_length, 1);
1375                 }
1376         }
1377         /*
1378          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1379          * within-command recovery checks before receiving the payload.
1380          */
1381         rc = iscsit_check_pre_dataout(cmd, buf);
1382         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1383                 return 0;
1384         else if (rc == DATAOUT_CANNOT_RECOVER)
1385                 return -1;
1386
1387         *out_cmd = cmd;
1388         return 0;
1389 }
1390 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1391
1392 static int
1393 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1394                    struct iscsi_data *hdr)
1395 {
1396         struct kvec *iov;
1397         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1398         u32 payload_length = ntoh24(hdr->dlength);
1399         int iov_ret, data_crc_failed = 0;
1400
1401         rx_size += payload_length;
1402         iov = &cmd->iov_data[0];
1403
1404         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1405                                    payload_length);
1406         if (iov_ret < 0)
1407                 return -1;
1408
1409         iov_count += iov_ret;
1410
1411         padding = ((-payload_length) & 3);
1412         if (padding != 0) {
1413                 iov[iov_count].iov_base = cmd->pad_bytes;
1414                 iov[iov_count++].iov_len = padding;
1415                 rx_size += padding;
1416                 pr_debug("Receiving %u padding bytes.\n", padding);
1417         }
1418
1419         if (conn->conn_ops->DataDigest) {
1420                 iov[iov_count].iov_base = &checksum;
1421                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1422                 rx_size += ISCSI_CRC_LEN;
1423         }
1424
1425         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1426
1427         iscsit_unmap_iovec(cmd);
1428
1429         if (rx_got != rx_size)
1430                 return -1;
1431
1432         if (conn->conn_ops->DataDigest) {
1433                 u32 data_crc;
1434
1435                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1436                                                     be32_to_cpu(hdr->offset),
1437                                                     payload_length, padding,
1438                                                     cmd->pad_bytes);
1439
1440                 if (checksum != data_crc) {
1441                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1442                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1443                                 " does not match computed 0x%08x\n",
1444                                 hdr->itt, hdr->offset, payload_length,
1445                                 hdr->datasn, checksum, data_crc);
1446                         data_crc_failed = 1;
1447                 } else {
1448                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1449                                 " %u bytes of Data Out\n", checksum,
1450                                 payload_length);
1451                 }
1452         }
1453
1454         return data_crc_failed;
1455 }
1456
1457 int
1458 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1459                              bool data_crc_failed)
1460 {
1461         struct iscsi_conn *conn = cmd->conn;
1462         int rc, ooo_cmdsn;
1463         /*
1464          * Increment post receive data and CRC values or perform
1465          * within-command recovery.
1466          */
1467         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1468         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1469                 return 0;
1470         else if (rc == DATAOUT_SEND_R2T) {
1471                 iscsit_set_dataout_sequence_values(cmd);
1472                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1473         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1474                 /*
1475                  * Handle extra special case for out of order
1476                  * Unsolicited Data Out.
1477                  */
1478                 spin_lock_bh(&cmd->istate_lock);
1479                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1480                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1481                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1482                 spin_unlock_bh(&cmd->istate_lock);
1483
1484                 iscsit_stop_dataout_timer(cmd);
1485                 if (ooo_cmdsn)
1486                         return 0;
1487                 target_execute_cmd(&cmd->se_cmd);
1488                 return 0;
1489         } else /* DATAOUT_CANNOT_RECOVER */
1490                 return -1;
1491
1492         return 0;
1493 }
1494 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1495
1496 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1497 {
1498         struct iscsi_cmd *cmd = NULL;
1499         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1500         int rc;
1501         bool data_crc_failed = false;
1502
1503         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1504         if (rc < 0)
1505                 return 0;
1506         else if (!cmd)
1507                 return 0;
1508
1509         rc = iscsit_get_dataout(conn, cmd, hdr);
1510         if (rc < 0)
1511                 return rc;
1512         else if (rc > 0)
1513                 data_crc_failed = true;
1514
1515         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1516 }
1517
1518 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1519                          struct iscsi_nopout *hdr)
1520 {
1521         u32 payload_length = ntoh24(hdr->dlength);
1522
1523         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1524                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1525                 if (!cmd)
1526                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1527                                                  (unsigned char *)hdr);
1528
1529                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1530                                          (unsigned char *)hdr);
1531         }
1532
1533         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1534                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1535                         " not set, protocol error.\n");
1536                 if (!cmd)
1537                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1538                                                  (unsigned char *)hdr);
1539
1540                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1541                                          (unsigned char *)hdr);
1542         }
1543
1544         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1545                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1546                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1547                         " error.\n", payload_length,
1548                         conn->conn_ops->MaxXmitDataSegmentLength);
1549                 if (!cmd)
1550                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1551                                                  (unsigned char *)hdr);
1552
1553                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1554                                          (unsigned char *)hdr);
1555         }
1556
1557         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1558                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1559                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1560                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1561                 payload_length);
1562         /*
1563          * This is not a response to a Unsolicited NopIN, which means
1564          * it can either be a NOPOUT ping request (with a valid ITT),
1565          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1566          * Either way, make sure we allocate an struct iscsi_cmd, as both
1567          * can contain ping data.
1568          */
1569         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1570                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1571                 cmd->i_state            = ISTATE_SEND_NOPIN;
1572                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1573                                                 1 : 0);
1574                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1575                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1576                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1577                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1578                 cmd->data_direction     = DMA_NONE;
1579         }
1580
1581         return 0;
1582 }
1583 EXPORT_SYMBOL(iscsit_setup_nop_out);
1584
1585 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1586                            struct iscsi_nopout *hdr)
1587 {
1588         struct iscsi_cmd *cmd_p = NULL;
1589         int cmdsn_ret = 0;
1590         /*
1591          * Initiator is expecting a NopIN ping reply..
1592          */
1593         if (hdr->itt != RESERVED_ITT) {
1594                 if (!cmd)
1595                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1596                                                 (unsigned char *)hdr);
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,
1611                                 (unsigned char *)hdr, hdr->cmdsn);
1612                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1613                         return 0;
1614                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1615                         return -1;
1616
1617                 return 0;
1618         }
1619         /*
1620          * This was a response to a unsolicited NOPIN ping.
1621          */
1622         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1623                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1624                 if (!cmd_p)
1625                         return -EINVAL;
1626
1627                 iscsit_stop_nopin_response_timer(conn);
1628
1629                 cmd_p->i_state = ISTATE_REMOVE;
1630                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1631
1632                 iscsit_start_nopin_timer(conn);
1633                 return 0;
1634         }
1635         /*
1636          * Otherwise, initiator is not expecting a NOPIN is response.
1637          * Just ignore for now.
1638          */
1639         return 0;
1640 }
1641 EXPORT_SYMBOL(iscsit_process_nop_out);
1642
1643 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1644                                  unsigned char *buf)
1645 {
1646         unsigned char *ping_data = NULL;
1647         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1648         struct kvec *iov = NULL;
1649         u32 payload_length = ntoh24(hdr->dlength);
1650         int ret;
1651
1652         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1653         if (ret < 0)
1654                 return 0;
1655         /*
1656          * Handle NOP-OUT payload for traditional iSCSI sockets
1657          */
1658         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1659                 u32 checksum, data_crc, padding = 0;
1660                 int niov = 0, rx_got, rx_size = payload_length;
1661
1662                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1663                 if (!ping_data) {
1664                         pr_err("Unable to allocate memory for"
1665                                 " NOPOUT ping data.\n");
1666                         ret = -1;
1667                         goto out;
1668                 }
1669
1670                 iov = &cmd->iov_misc[0];
1671                 iov[niov].iov_base      = ping_data;
1672                 iov[niov++].iov_len     = payload_length;
1673
1674                 padding = ((-payload_length) & 3);
1675                 if (padding != 0) {
1676                         pr_debug("Receiving %u additional bytes"
1677                                 " for padding.\n", padding);
1678                         iov[niov].iov_base      = &cmd->pad_bytes;
1679                         iov[niov++].iov_len     = padding;
1680                         rx_size += padding;
1681                 }
1682                 if (conn->conn_ops->DataDigest) {
1683                         iov[niov].iov_base      = &checksum;
1684                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1685                         rx_size += ISCSI_CRC_LEN;
1686                 }
1687
1688                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1689                 if (rx_got != rx_size) {
1690                         ret = -1;
1691                         goto out;
1692                 }
1693
1694                 if (conn->conn_ops->DataDigest) {
1695                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1696                                         ping_data, payload_length,
1697                                         padding, cmd->pad_bytes,
1698                                         (u8 *)&data_crc);
1699
1700                         if (checksum != data_crc) {
1701                                 pr_err("Ping data CRC32C DataDigest"
1702                                 " 0x%08x does not match computed 0x%08x\n",
1703                                         checksum, data_crc);
1704                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1705                                         pr_err("Unable to recover from"
1706                                         " NOPOUT Ping DataCRC failure while in"
1707                                                 " ERL=0.\n");
1708                                         ret = -1;
1709                                         goto out;
1710                                 } else {
1711                                         /*
1712                                          * Silently drop this PDU and let the
1713                                          * initiator plug the CmdSN gap.
1714                                          */
1715                                         pr_debug("Dropping NOPOUT"
1716                                         " Command CmdSN: 0x%08x due to"
1717                                         " DataCRC error.\n", hdr->cmdsn);
1718                                         ret = 0;
1719                                         goto out;
1720                                 }
1721                         } else {
1722                                 pr_debug("Got CRC32C DataDigest"
1723                                 " 0x%08x for %u bytes of ping data.\n",
1724                                         checksum, payload_length);
1725                         }
1726                 }
1727
1728                 ping_data[payload_length] = '\0';
1729                 /*
1730                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1731                  */
1732                 cmd->buf_ptr = ping_data;
1733                 cmd->buf_ptr_size = payload_length;
1734
1735                 pr_debug("Got %u bytes of NOPOUT ping"
1736                         " data.\n", payload_length);
1737                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1738         }
1739
1740         return iscsit_process_nop_out(conn, cmd, hdr);
1741 out:
1742         if (cmd)
1743                 iscsit_free_cmd(cmd, false);
1744
1745         kfree(ping_data);
1746         return ret;
1747 }
1748
1749 int
1750 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1751                            unsigned char *buf)
1752 {
1753         struct se_tmr_req *se_tmr;
1754         struct iscsi_tmr_req *tmr_req;
1755         struct iscsi_tm *hdr;
1756         int out_of_order_cmdsn = 0, ret;
1757         bool sess_ref = false;
1758         u8 function;
1759
1760         hdr                     = (struct iscsi_tm *) buf;
1761         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1762         function = hdr->flags;
1763
1764         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1765                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1766                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1767                 hdr->rtt, hdr->refcmdsn, conn->cid);
1768
1769         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1770             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1771              hdr->rtt != RESERVED_ITT)) {
1772                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1773                 hdr->rtt = RESERVED_ITT;
1774         }
1775
1776         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1777                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1778                 pr_err("Task Management Request TASK_REASSIGN not"
1779                         " issued as immediate command, bad iSCSI Initiator"
1780                                 "implementation\n");
1781                 return iscsit_add_reject_cmd(cmd,
1782                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1783         }
1784         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1785             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1786                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1787
1788         cmd->data_direction = DMA_NONE;
1789
1790         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1791         if (!cmd->tmr_req) {
1792                 pr_err("Unable to allocate memory for"
1793                         " Task Management command!\n");
1794                 return iscsit_add_reject_cmd(cmd,
1795                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1796                                              buf);
1797         }
1798
1799         /*
1800          * TASK_REASSIGN for ERL=2 / connection stays inside of
1801          * LIO-Target $FABRIC_MOD
1802          */
1803         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1804
1805                 u8 tcm_function;
1806                 int ret;
1807
1808                 transport_init_se_cmd(&cmd->se_cmd,
1809                                       &lio_target_fabric_configfs->tf_ops,
1810                                       conn->sess->se_sess, 0, DMA_NONE,
1811                                       TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1812
1813                 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1814                 sess_ref = true;
1815
1816                 switch (function) {
1817                 case ISCSI_TM_FUNC_ABORT_TASK:
1818                         tcm_function = TMR_ABORT_TASK;
1819                         break;
1820                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1821                         tcm_function = TMR_ABORT_TASK_SET;
1822                         break;
1823                 case ISCSI_TM_FUNC_CLEAR_ACA:
1824                         tcm_function = TMR_CLEAR_ACA;
1825                         break;
1826                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1827                         tcm_function = TMR_CLEAR_TASK_SET;
1828                         break;
1829                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1830                         tcm_function = TMR_LUN_RESET;
1831                         break;
1832                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1833                         tcm_function = TMR_TARGET_WARM_RESET;
1834                         break;
1835                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1836                         tcm_function = TMR_TARGET_COLD_RESET;
1837                         break;
1838                 default:
1839                         pr_err("Unknown iSCSI TMR Function:"
1840                                " 0x%02x\n", function);
1841                         return iscsit_add_reject_cmd(cmd,
1842                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
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_cmd(cmd,
1849                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1850
1851                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1852         }
1853
1854         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1855         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1856         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1857         cmd->init_task_tag      = hdr->itt;
1858         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1859         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1860         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1861         se_tmr                  = cmd->se_cmd.se_tmr_req;
1862         tmr_req                 = cmd->tmr_req;
1863         /*
1864          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1865          */
1866         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1867                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1868                                                scsilun_to_int(&hdr->lun));
1869                 if (ret < 0) {
1870                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1871                         goto attach;
1872                 }
1873         }
1874
1875         switch (function) {
1876         case ISCSI_TM_FUNC_ABORT_TASK:
1877                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1878                 if (se_tmr->response)
1879                         goto attach;
1880                 break;
1881         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1882         case ISCSI_TM_FUNC_CLEAR_ACA:
1883         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1884         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1885                 break;
1886         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1887                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1888                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1889                         goto attach;
1890                 }
1891                 break;
1892         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1893                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1894                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1895                         goto attach;
1896                 }
1897                 break;
1898         case ISCSI_TM_FUNC_TASK_REASSIGN:
1899                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1900                 /*
1901                  * Perform sanity checks on the ExpDataSN only if the
1902                  * TASK_REASSIGN was successful.
1903                  */
1904                 if (se_tmr->response)
1905                         break;
1906
1907                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1908                         return iscsit_add_reject_cmd(cmd,
1909                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
1910                 break;
1911         default:
1912                 pr_err("Unknown TMR function: 0x%02x, protocol"
1913                         " error.\n", function);
1914                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1915                 goto attach;
1916         }
1917
1918         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1919             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1920                 se_tmr->call_transport = 1;
1921 attach:
1922         spin_lock_bh(&conn->cmd_lock);
1923         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1924         spin_unlock_bh(&conn->cmd_lock);
1925
1926         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1927                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1928                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1929                         out_of_order_cmdsn = 1;
1930                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1931                         return 0;
1932                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1933                         return -1;
1934         }
1935         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1936
1937         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1938                 return 0;
1939         /*
1940          * Found the referenced task, send to transport for processing.
1941          */
1942         if (se_tmr->call_transport)
1943                 return transport_generic_handle_tmr(&cmd->se_cmd);
1944
1945         /*
1946          * Could not find the referenced LUN, task, or Task Management
1947          * command not authorized or supported.  Change state and
1948          * let the tx_thread send the response.
1949          *
1950          * For connection recovery, this is also the default action for
1951          * TMR TASK_REASSIGN.
1952          */
1953         if (sess_ref) {
1954                 pr_debug("Handle TMR, using sess_ref=true check\n");
1955                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1956         }
1957
1958         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1959         return 0;
1960 }
1961 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1962
1963 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1964 int
1965 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1966                       struct iscsi_text *hdr)
1967 {
1968         u32 payload_length = ntoh24(hdr->dlength);
1969
1970         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1971                 pr_err("Unable to accept text parameter length: %u"
1972                         "greater than MaxXmitDataSegmentLength %u.\n",
1973                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1974                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1975                                          (unsigned char *)hdr);
1976         }
1977
1978         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1979              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1980                 pr_err("Multi sequence text commands currently not supported\n");
1981                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1982                                         (unsigned char *)hdr);
1983         }
1984
1985         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1986                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1987                 hdr->exp_statsn, payload_length);
1988
1989         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1990         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1991         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1992         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1993         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1994         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1995         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1996         cmd->data_direction     = DMA_NONE;
1997         cmd->text_in_ptr        = NULL;
1998
1999         return 0;
2000 }
2001 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2002
2003 int
2004 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2005                         struct iscsi_text *hdr)
2006 {
2007         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2008         int cmdsn_ret;
2009
2010         if (!text_in) {
2011                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2012                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2013                         pr_err("Unable to locate text_in buffer for sendtargets"
2014                                " discovery\n");
2015                         goto reject;
2016                 }
2017                 goto empty_sendtargets;
2018         }
2019         if (strncmp("SendTargets", text_in, 11) != 0) {
2020                 pr_err("Received Text Data that is not"
2021                         " SendTargets, cannot continue.\n");
2022                 goto reject;
2023         }
2024         text_ptr = strchr(text_in, '=');
2025         if (!text_ptr) {
2026                 pr_err("No \"=\" separator found in Text Data,"
2027                         "  cannot continue.\n");
2028                 goto reject;
2029         }
2030         if (!strncmp("=All", text_ptr, 4)) {
2031                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2032         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2033                    !strncmp("=eui.", text_ptr, 5)) {
2034                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2035         } else {
2036                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2037                 goto reject;
2038         }
2039
2040         spin_lock_bh(&conn->cmd_lock);
2041         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2042         spin_unlock_bh(&conn->cmd_lock);
2043
2044 empty_sendtargets:
2045         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2046
2047         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2048                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2049                                 (unsigned char *)hdr, hdr->cmdsn);
2050                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2051                         return -1;
2052
2053                 return 0;
2054         }
2055
2056         return iscsit_execute_cmd(cmd, 0);
2057
2058 reject:
2059         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2060                                  (unsigned char *)hdr);
2061 }
2062 EXPORT_SYMBOL(iscsit_process_text_cmd);
2063
2064 static int
2065 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2066                        unsigned char *buf)
2067 {
2068         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2069         char *text_in = NULL;
2070         u32 payload_length = ntoh24(hdr->dlength);
2071         int rx_size, rc;
2072
2073         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2074         if (rc < 0)
2075                 return 0;
2076
2077         rx_size = payload_length;
2078         if (payload_length) {
2079                 u32 checksum = 0, data_crc = 0;
2080                 u32 padding = 0, pad_bytes = 0;
2081                 int niov = 0, rx_got;
2082                 struct kvec iov[3];
2083
2084                 text_in = kzalloc(payload_length, GFP_KERNEL);
2085                 if (!text_in) {
2086                         pr_err("Unable to allocate memory for"
2087                                 " incoming text parameters\n");
2088                         goto reject;
2089                 }
2090                 cmd->text_in_ptr = text_in;
2091
2092                 memset(iov, 0, 3 * sizeof(struct kvec));
2093                 iov[niov].iov_base      = text_in;
2094                 iov[niov++].iov_len     = payload_length;
2095
2096                 padding = ((-payload_length) & 3);
2097                 if (padding != 0) {
2098                         iov[niov].iov_base = &pad_bytes;
2099                         iov[niov++].iov_len  = padding;
2100                         rx_size += padding;
2101                         pr_debug("Receiving %u additional bytes"
2102                                         " for padding.\n", padding);
2103                 }
2104                 if (conn->conn_ops->DataDigest) {
2105                         iov[niov].iov_base      = &checksum;
2106                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2107                         rx_size += ISCSI_CRC_LEN;
2108                 }
2109
2110                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2111                 if (rx_got != rx_size)
2112                         goto reject;
2113
2114                 if (conn->conn_ops->DataDigest) {
2115                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2116                                         text_in, payload_length,
2117                                         padding, (u8 *)&pad_bytes,
2118                                         (u8 *)&data_crc);
2119
2120                         if (checksum != data_crc) {
2121                                 pr_err("Text data CRC32C DataDigest"
2122                                         " 0x%08x does not match computed"
2123                                         " 0x%08x\n", checksum, data_crc);
2124                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2125                                         pr_err("Unable to recover from"
2126                                         " Text Data digest failure while in"
2127                                                 " ERL=0.\n");
2128                                         goto reject;
2129                                 } else {
2130                                         /*
2131                                          * Silently drop this PDU and let the
2132                                          * initiator plug the CmdSN gap.
2133                                          */
2134                                         pr_debug("Dropping Text"
2135                                         " Command CmdSN: 0x%08x due to"
2136                                         " DataCRC error.\n", hdr->cmdsn);
2137                                         kfree(text_in);
2138                                         return 0;
2139                                 }
2140                         } else {
2141                                 pr_debug("Got CRC32C DataDigest"
2142                                         " 0x%08x for %u bytes of text data.\n",
2143                                                 checksum, payload_length);
2144                         }
2145                 }
2146                 text_in[payload_length - 1] = '\0';
2147                 pr_debug("Successfully read %d bytes of text"
2148                                 " data.\n", payload_length);
2149         }
2150
2151         return iscsit_process_text_cmd(conn, cmd, hdr);
2152
2153 reject:
2154         kfree(cmd->text_in_ptr);
2155         cmd->text_in_ptr = NULL;
2156         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2157 }
2158 EXPORT_SYMBOL(iscsit_handle_text_cmd);
2159
2160 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2161 {
2162         struct iscsi_conn *conn_p;
2163         struct iscsi_session *sess = conn->sess;
2164
2165         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2166                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2167
2168         atomic_set(&sess->session_logout, 1);
2169         atomic_set(&conn->conn_logout_remove, 1);
2170         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2171
2172         iscsit_inc_conn_usage_count(conn);
2173         iscsit_inc_session_usage_count(sess);
2174
2175         spin_lock_bh(&sess->conn_lock);
2176         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2177                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2178                         continue;
2179
2180                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2181                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2182         }
2183         spin_unlock_bh(&sess->conn_lock);
2184
2185         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2186
2187         return 0;
2188 }
2189
2190 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2191 {
2192         struct iscsi_conn *l_conn;
2193         struct iscsi_session *sess = conn->sess;
2194
2195         pr_debug("Received logout request CLOSECONNECTION for CID:"
2196                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2197
2198         /*
2199          * A Logout Request with a CLOSECONNECTION reason code for a CID
2200          * can arrive on a connection with a differing CID.
2201          */
2202         if (conn->cid == cmd->logout_cid) {
2203                 spin_lock_bh(&conn->state_lock);
2204                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2205                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2206
2207                 atomic_set(&conn->conn_logout_remove, 1);
2208                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2209                 iscsit_inc_conn_usage_count(conn);
2210
2211                 spin_unlock_bh(&conn->state_lock);
2212         } else {
2213                 /*
2214                  * Handle all different cid CLOSECONNECTION requests in
2215                  * iscsit_logout_post_handler_diffcid() as to give enough
2216                  * time for any non immediate command's CmdSN to be
2217                  * acknowledged on the connection in question.
2218                  *
2219                  * Here we simply make sure the CID is still around.
2220                  */
2221                 l_conn = iscsit_get_conn_from_cid(sess,
2222                                 cmd->logout_cid);
2223                 if (!l_conn) {
2224                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2225                         iscsit_add_cmd_to_response_queue(cmd, conn,
2226                                         cmd->i_state);
2227                         return 0;
2228                 }
2229
2230                 iscsit_dec_conn_usage_count(l_conn);
2231         }
2232
2233         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2234
2235         return 0;
2236 }
2237
2238 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2239 {
2240         struct iscsi_session *sess = conn->sess;
2241
2242         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2243                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2244
2245         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2246                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2247                         " while ERL!=2.\n");
2248                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2249                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2250                 return 0;
2251         }
2252
2253         if (conn->cid == cmd->logout_cid) {
2254                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2255                         " with CID: %hu on CID: %hu, implementation error.\n",
2256                                 cmd->logout_cid, conn->cid);
2257                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2258                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2259                 return 0;
2260         }
2261
2262         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2263
2264         return 0;
2265 }
2266
2267 int
2268 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2269                         unsigned char *buf)
2270 {
2271         int cmdsn_ret, logout_remove = 0;
2272         u8 reason_code = 0;
2273         struct iscsi_logout *hdr;
2274         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2275
2276         hdr                     = (struct iscsi_logout *) buf;
2277         reason_code             = (hdr->flags & 0x7f);
2278
2279         if (tiqn) {
2280                 spin_lock(&tiqn->logout_stats.lock);
2281                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2282                         tiqn->logout_stats.normal_logouts++;
2283                 else
2284                         tiqn->logout_stats.abnormal_logouts++;
2285                 spin_unlock(&tiqn->logout_stats.lock);
2286         }
2287
2288         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2289                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2290                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2291                 hdr->cid, conn->cid);
2292
2293         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2294                 pr_err("Received logout request on connection that"
2295                         " is not in logged in state, ignoring request.\n");
2296                 iscsit_free_cmd(cmd, false);
2297                 return 0;
2298         }
2299
2300         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2301         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2302         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2303         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2304         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2305         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2306         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2307         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2308         cmd->logout_reason      = reason_code;
2309         cmd->data_direction     = DMA_NONE;
2310
2311         /*
2312          * We need to sleep in these cases (by returning 1) until the Logout
2313          * Response gets sent in the tx thread.
2314          */
2315         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2316            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2317             be16_to_cpu(hdr->cid) == conn->cid))
2318                 logout_remove = 1;
2319
2320         spin_lock_bh(&conn->cmd_lock);
2321         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2322         spin_unlock_bh(&conn->cmd_lock);
2323
2324         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2325                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2326
2327         /*
2328          * Immediate commands are executed, well, immediately.
2329          * Non-Immediate Logout Commands are executed in CmdSN order.
2330          */
2331         if (cmd->immediate_cmd) {
2332                 int ret = iscsit_execute_cmd(cmd, 0);
2333
2334                 if (ret < 0)
2335                         return ret;
2336         } else {
2337                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2338                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2339                         logout_remove = 0;
2340                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2341                         return -1;
2342         }
2343
2344         return logout_remove;
2345 }
2346 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2347
2348 static int iscsit_handle_snack(
2349         struct iscsi_conn *conn,
2350         unsigned char *buf)
2351 {
2352         struct iscsi_snack *hdr;
2353
2354         hdr                     = (struct iscsi_snack *) buf;
2355         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2356
2357         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2358                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2359                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2360                         hdr->begrun, hdr->runlength, conn->cid);
2361
2362         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2363                 pr_err("Initiator sent SNACK request while in"
2364                         " ErrorRecoveryLevel=0.\n");
2365                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2366                                          buf);
2367         }
2368         /*
2369          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2370          * call from inside iscsi_send_recovery_datain_or_r2t().
2371          */
2372         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2373         case 0:
2374                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2375                         hdr->itt,
2376                         be32_to_cpu(hdr->ttt),
2377                         be32_to_cpu(hdr->begrun),
2378                         be32_to_cpu(hdr->runlength));
2379         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2380                 return iscsit_handle_status_snack(conn, hdr->itt,
2381                         be32_to_cpu(hdr->ttt),
2382                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2383         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2384                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2385                         be32_to_cpu(hdr->begrun),
2386                         be32_to_cpu(hdr->runlength));
2387         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2388                 /* FIXME: Support R-Data SNACK */
2389                 pr_err("R-Data SNACK Not Supported.\n");
2390                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2391                                          buf);
2392         default:
2393                 pr_err("Unknown SNACK type 0x%02x, protocol"
2394                         " error.\n", hdr->flags & 0x0f);
2395                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2396                                          buf);
2397         }
2398
2399         return 0;
2400 }
2401
2402 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2403 {
2404         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2405             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2406                 wait_for_completion_interruptible_timeout(
2407                                         &conn->rx_half_close_comp,
2408                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2409         }
2410 }
2411
2412 static int iscsit_handle_immediate_data(
2413         struct iscsi_cmd *cmd,
2414         struct iscsi_scsi_req *hdr,
2415         u32 length)
2416 {
2417         int iov_ret, rx_got = 0, rx_size = 0;
2418         u32 checksum, iov_count = 0, padding = 0;
2419         struct iscsi_conn *conn = cmd->conn;
2420         struct kvec *iov;
2421
2422         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2423         if (iov_ret < 0)
2424                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2425
2426         rx_size = length;
2427         iov_count = iov_ret;
2428         iov = &cmd->iov_data[0];
2429
2430         padding = ((-length) & 3);
2431         if (padding != 0) {
2432                 iov[iov_count].iov_base = cmd->pad_bytes;
2433                 iov[iov_count++].iov_len = padding;
2434                 rx_size += padding;
2435         }
2436
2437         if (conn->conn_ops->DataDigest) {
2438                 iov[iov_count].iov_base         = &checksum;
2439                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2440                 rx_size += ISCSI_CRC_LEN;
2441         }
2442
2443         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2444
2445         iscsit_unmap_iovec(cmd);
2446
2447         if (rx_got != rx_size) {
2448                 iscsit_rx_thread_wait_for_tcp(conn);
2449                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2450         }
2451
2452         if (conn->conn_ops->DataDigest) {
2453                 u32 data_crc;
2454
2455                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2456                                                     cmd->write_data_done, length, padding,
2457                                                     cmd->pad_bytes);
2458
2459                 if (checksum != data_crc) {
2460                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2461                                 " does not match computed 0x%08x\n", checksum,
2462                                 data_crc);
2463
2464                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2465                                 pr_err("Unable to recover from"
2466                                         " Immediate Data digest failure while"
2467                                         " in ERL=0.\n");
2468                                 iscsit_reject_cmd(cmd,
2469                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2470                                                 (unsigned char *)hdr);
2471                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2472                         } else {
2473                                 iscsit_reject_cmd(cmd,
2474                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2475                                                 (unsigned char *)hdr);
2476                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2477                         }
2478                 } else {
2479                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2480                                 " %u bytes of Immediate Data\n", checksum,
2481                                 length);
2482                 }
2483         }
2484
2485         cmd->write_data_done += length;
2486
2487         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2488                 spin_lock_bh(&cmd->istate_lock);
2489                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2490                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2491                 spin_unlock_bh(&cmd->istate_lock);
2492         }
2493
2494         return IMMEDIATE_DATA_NORMAL_OPERATION;
2495 }
2496
2497 /*
2498  *      Called with sess->conn_lock held.
2499  */
2500 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2501         with active network interface */
2502 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2503 {
2504         struct iscsi_cmd *cmd;
2505         struct iscsi_conn *conn_p;
2506         bool found = false;
2507
2508         /*
2509          * Only send a Asynchronous Message on connections whos network
2510          * interface is still functional.
2511          */
2512         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2513                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2514                         iscsit_inc_conn_usage_count(conn_p);
2515                         found = true;
2516                         break;
2517                 }
2518         }
2519
2520         if (!found)
2521                 return;
2522
2523         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2524         if (!cmd) {
2525                 iscsit_dec_conn_usage_count(conn_p);
2526                 return;
2527         }
2528
2529         cmd->logout_cid = conn->cid;
2530         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2531         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2532
2533         spin_lock_bh(&conn_p->cmd_lock);
2534         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2535         spin_unlock_bh(&conn_p->cmd_lock);
2536
2537         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2538         iscsit_dec_conn_usage_count(conn_p);
2539 }
2540
2541 static int iscsit_send_conn_drop_async_message(
2542         struct iscsi_cmd *cmd,
2543         struct iscsi_conn *conn)
2544 {
2545         struct iscsi_async *hdr;
2546
2547         cmd->tx_size = ISCSI_HDR_LEN;
2548         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2549
2550         hdr                     = (struct iscsi_async *) cmd->pdu;
2551         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2552         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2553         cmd->init_task_tag      = RESERVED_ITT;
2554         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2555         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2556         cmd->stat_sn            = conn->stat_sn++;
2557         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2558         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2559         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2560         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2561         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2562         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2563         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2564
2565         if (conn->conn_ops->HeaderDigest) {
2566                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2567
2568                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2569                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2570
2571                 cmd->tx_size += ISCSI_CRC_LEN;
2572                 pr_debug("Attaching CRC32C HeaderDigest to"
2573                         " Async Message 0x%08x\n", *header_digest);
2574         }
2575
2576         cmd->iov_misc[0].iov_base       = cmd->pdu;
2577         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2578         cmd->iov_misc_count             = 1;
2579
2580         pr_debug("Sending Connection Dropped Async Message StatSN:"
2581                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2582                         cmd->logout_cid, conn->cid);
2583         return 0;
2584 }
2585
2586 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2587 {
2588         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2589             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2590                 wait_for_completion_interruptible_timeout(
2591                                         &conn->tx_half_close_comp,
2592                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2593         }
2594 }
2595
2596 static void
2597 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2598                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2599                         bool set_statsn)
2600 {
2601         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2602         hdr->flags              = datain->flags;
2603         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2604                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2605                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2606                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2607                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2608                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2609                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2610                 }
2611         }
2612         hton24(hdr->dlength, datain->length);
2613         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2614                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2615                                 (struct scsi_lun *)&hdr->lun);
2616         else
2617                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2618
2619         hdr->itt                = cmd->init_task_tag;
2620
2621         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2622                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2623         else
2624                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2625         if (set_statsn)
2626                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2627         else
2628                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2629
2630         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2631         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2632         hdr->datasn             = cpu_to_be32(datain->data_sn);
2633         hdr->offset             = cpu_to_be32(datain->offset);
2634
2635         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2636                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2637                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2638                 ntohl(hdr->offset), datain->length, conn->cid);
2639 }
2640
2641 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2642 {
2643         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2644         struct iscsi_datain datain;
2645         struct iscsi_datain_req *dr;
2646         struct kvec *iov;
2647         u32 iov_count = 0, tx_size = 0;
2648         int eodr = 0, ret, iov_ret;
2649         bool set_statsn = false;
2650
2651         memset(&datain, 0, sizeof(struct iscsi_datain));
2652         dr = iscsit_get_datain_values(cmd, &datain);
2653         if (!dr) {
2654                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2655                                 cmd->init_task_tag);
2656                 return -1;
2657         }
2658         /*
2659          * Be paranoid and double check the logic for now.
2660          */
2661         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2662                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2663                         " datain.length: %u exceeds cmd->data_length: %u\n",
2664                         cmd->init_task_tag, datain.offset, datain.length,
2665                         cmd->se_cmd.data_length);
2666                 return -1;
2667         }
2668
2669         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2670         /*
2671          * Special case for successfully execution w/ both DATAIN
2672          * and Sense Data.
2673          */
2674         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2675             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2676                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2677         else {
2678                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2679                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2680                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2681                         cmd->stat_sn = conn->stat_sn++;
2682                         set_statsn = true;
2683                 } else if (dr->dr_complete ==
2684                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2685                         set_statsn = true;
2686         }
2687
2688         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2689
2690         iov = &cmd->iov_data[0];
2691         iov[iov_count].iov_base = cmd->pdu;
2692         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2693         tx_size += ISCSI_HDR_LEN;
2694
2695         if (conn->conn_ops->HeaderDigest) {
2696                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2697
2698                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2699                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2700
2701                 iov[0].iov_len += ISCSI_CRC_LEN;
2702                 tx_size += ISCSI_CRC_LEN;
2703
2704                 pr_debug("Attaching CRC32 HeaderDigest"
2705                         " for DataIN PDU 0x%08x\n", *header_digest);
2706         }
2707
2708         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2709                                 datain.offset, datain.length);
2710         if (iov_ret < 0)
2711                 return -1;
2712
2713         iov_count += iov_ret;
2714         tx_size += datain.length;
2715
2716         cmd->padding = ((-datain.length) & 3);
2717         if (cmd->padding) {
2718                 iov[iov_count].iov_base         = cmd->pad_bytes;
2719                 iov[iov_count++].iov_len        = cmd->padding;
2720                 tx_size += cmd->padding;
2721
2722                 pr_debug("Attaching %u padding bytes\n",
2723                                 cmd->padding);
2724         }
2725         if (conn->conn_ops->DataDigest) {
2726                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2727                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2728
2729                 iov[iov_count].iov_base = &cmd->data_crc;
2730                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2731                 tx_size += ISCSI_CRC_LEN;
2732
2733                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2734                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2735         }
2736
2737         cmd->iov_data_count = iov_count;
2738         cmd->tx_size = tx_size;
2739
2740         /* sendpage is preferred but can't insert markers */
2741         if (!conn->conn_ops->IFMarker)
2742                 ret = iscsit_fe_sendpage_sg(cmd, conn);
2743         else
2744                 ret = iscsit_send_tx_data(cmd, conn, 0);
2745
2746         iscsit_unmap_iovec(cmd);
2747
2748         if (ret < 0) {
2749                 iscsit_tx_thread_wait_for_tcp(conn);
2750                 return ret;
2751         }
2752
2753         if (dr->dr_complete) {
2754                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2755                                 2 : 1;
2756                 iscsit_free_datain_req(cmd, dr);
2757         }
2758
2759         return eodr;
2760 }
2761
2762 int
2763 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2764                         struct iscsi_logout_rsp *hdr)
2765 {
2766         struct iscsi_conn *logout_conn = NULL;
2767         struct iscsi_conn_recovery *cr = NULL;
2768         struct iscsi_session *sess = conn->sess;
2769         /*
2770          * The actual shutting down of Sessions and/or Connections
2771          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2772          * is done in scsi_logout_post_handler().
2773          */
2774         switch (cmd->logout_reason) {
2775         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2776                 pr_debug("iSCSI session logout successful, setting"
2777                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2778                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2779                 break;
2780         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2781                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2782                         break;
2783                 /*
2784                  * For CLOSECONNECTION logout requests carrying
2785                  * a matching logout CID -> local CID, the reference
2786                  * for the local CID will have been incremented in
2787                  * iscsi_logout_closeconnection().
2788                  *
2789                  * For CLOSECONNECTION logout requests carrying
2790                  * a different CID than the connection it arrived
2791                  * on, the connection responding to cmd->logout_cid
2792                  * is stopped in iscsit_logout_post_handler_diffcid().
2793                  */
2794
2795                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2796                         " successful.\n", cmd->logout_cid, conn->cid);
2797                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2798                 break;
2799         case ISCSI_LOGOUT_REASON_RECOVERY:
2800                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2801                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2802                         break;
2803                 /*
2804                  * If the connection is still active from our point of view
2805                  * force connection recovery to occur.
2806                  */
2807                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2808                                 cmd->logout_cid);
2809                 if (logout_conn) {
2810                         iscsit_connection_reinstatement_rcfr(logout_conn);
2811                         iscsit_dec_conn_usage_count(logout_conn);
2812                 }
2813
2814                 cr = iscsit_get_inactive_connection_recovery_entry(
2815                                 conn->sess, cmd->logout_cid);
2816                 if (!cr) {
2817                         pr_err("Unable to locate CID: %hu for"
2818                         " REMOVECONNFORRECOVERY Logout Request.\n",
2819                                 cmd->logout_cid);
2820                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2821                         break;
2822                 }
2823
2824                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2825
2826                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2827                         " for recovery for CID: %hu on CID: %hu successful.\n",
2828                                 cmd->logout_cid, conn->cid);
2829                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2830                 break;
2831         default:
2832                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2833                                 cmd->logout_reason);
2834                 return -1;
2835         }
2836
2837         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2838         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2839         hdr->response           = cmd->logout_response;
2840         hdr->itt                = cmd->init_task_tag;
2841         cmd->stat_sn            = conn->stat_sn++;
2842         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2843
2844         iscsit_increment_maxcmdsn(cmd, conn->sess);
2845         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2846         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2847
2848         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2849                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2850                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2851                 cmd->logout_cid, conn->cid);
2852
2853         return 0;
2854 }
2855 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2856
2857 static int
2858 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2859 {
2860         struct kvec *iov;
2861         int niov = 0, tx_size, rc;
2862
2863         rc = iscsit_build_logout_rsp(cmd, conn,
2864                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2865         if (rc < 0)
2866                 return rc;
2867
2868         tx_size = ISCSI_HDR_LEN;
2869         iov = &cmd->iov_misc[0];
2870         iov[niov].iov_base      = cmd->pdu;
2871         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2872
2873         if (conn->conn_ops->HeaderDigest) {
2874                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2875
2876                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2877                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2878
2879                 iov[0].iov_len += ISCSI_CRC_LEN;
2880                 tx_size += ISCSI_CRC_LEN;
2881                 pr_debug("Attaching CRC32C HeaderDigest to"
2882                         " Logout Response 0x%08x\n", *header_digest);
2883         }
2884         cmd->iov_misc_count = niov;
2885         cmd->tx_size = tx_size;
2886
2887         return 0;
2888 }
2889
2890 void
2891 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2892                        struct iscsi_nopin *hdr, bool nopout_response)
2893 {
2894         hdr->opcode             = ISCSI_OP_NOOP_IN;
2895         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2896         hton24(hdr->dlength, cmd->buf_ptr_size);
2897         if (nopout_response)
2898                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2899         hdr->itt                = cmd->init_task_tag;
2900         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2901         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2902                                   conn->stat_sn;
2903         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2904
2905         if (nopout_response)
2906                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2907
2908         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2909         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2910
2911         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2912                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2913                 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2914                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2915 }
2916 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2917
2918 /*
2919  *      Unsolicited NOPIN, either requesting a response or not.
2920  */
2921 static int iscsit_send_unsolicited_nopin(
2922         struct iscsi_cmd *cmd,
2923         struct iscsi_conn *conn,
2924         int want_response)
2925 {
2926         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2927         int tx_size = ISCSI_HDR_LEN, ret;
2928
2929         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2930
2931         if (conn->conn_ops->HeaderDigest) {
2932                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2933
2934                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2935                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2936
2937                 tx_size += ISCSI_CRC_LEN;
2938                 pr_debug("Attaching CRC32C HeaderDigest to"
2939                         " NopIN 0x%08x\n", *header_digest);
2940         }
2941
2942         cmd->iov_misc[0].iov_base       = cmd->pdu;
2943         cmd->iov_misc[0].iov_len        = tx_size;
2944         cmd->iov_misc_count     = 1;
2945         cmd->tx_size            = tx_size;
2946
2947         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2948                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2949
2950         ret = iscsit_send_tx_data(cmd, conn, 1);
2951         if (ret < 0) {
2952                 iscsit_tx_thread_wait_for_tcp(conn);
2953                 return ret;
2954         }
2955
2956         spin_lock_bh(&cmd->istate_lock);
2957         cmd->i_state = want_response ?
2958                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2959         spin_unlock_bh(&cmd->istate_lock);
2960
2961         return 0;
2962 }
2963
2964 static int
2965 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2966 {
2967         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2968         struct kvec *iov;
2969         u32 padding = 0;
2970         int niov = 0, tx_size;
2971
2972         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2973
2974         tx_size = ISCSI_HDR_LEN;
2975         iov = &cmd->iov_misc[0];
2976         iov[niov].iov_base      = cmd->pdu;
2977         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2978
2979         if (conn->conn_ops->HeaderDigest) {
2980                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2981
2982                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2983                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2984
2985                 iov[0].iov_len += ISCSI_CRC_LEN;
2986                 tx_size += ISCSI_CRC_LEN;
2987                 pr_debug("Attaching CRC32C HeaderDigest"
2988                         " to NopIn 0x%08x\n", *header_digest);
2989         }
2990
2991         /*
2992          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2993          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2994          */
2995         if (cmd->buf_ptr_size) {
2996                 iov[niov].iov_base      = cmd->buf_ptr;
2997                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2998                 tx_size += cmd->buf_ptr_size;
2999
3000                 pr_debug("Echoing back %u bytes of ping"
3001                         " data.\n", cmd->buf_ptr_size);
3002
3003                 padding = ((-cmd->buf_ptr_size) & 3);
3004                 if (padding != 0) {
3005                         iov[niov].iov_base = &cmd->pad_bytes;
3006                         iov[niov++].iov_len = padding;
3007                         tx_size += padding;
3008                         pr_debug("Attaching %u additional"
3009                                 " padding bytes.\n", padding);
3010                 }
3011                 if (conn->conn_ops->DataDigest) {
3012                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3013                                 cmd->buf_ptr, cmd->buf_ptr_size,
3014                                 padding, (u8 *)&cmd->pad_bytes,
3015                                 (u8 *)&cmd->data_crc);
3016
3017                         iov[niov].iov_base = &cmd->data_crc;
3018                         iov[niov++].iov_len = ISCSI_CRC_LEN;
3019                         tx_size += ISCSI_CRC_LEN;
3020                         pr_debug("Attached DataDigest for %u"
3021                                 " bytes of ping data, CRC 0x%08x\n",
3022                                 cmd->buf_ptr_size, cmd->data_crc);
3023                 }
3024         }
3025
3026         cmd->iov_misc_count = niov;
3027         cmd->tx_size = tx_size;
3028
3029         return 0;
3030 }
3031
3032 static int iscsit_send_r2t(
3033         struct iscsi_cmd *cmd,
3034         struct iscsi_conn *conn)
3035 {
3036         int tx_size = 0;
3037         struct iscsi_r2t *r2t;
3038         struct iscsi_r2t_rsp *hdr;
3039         int ret;
3040
3041         r2t = iscsit_get_r2t_from_list(cmd);
3042         if (!r2t)
3043                 return -1;
3044
3045         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3046         memset(hdr, 0, ISCSI_HDR_LEN);
3047         hdr->opcode             = ISCSI_OP_R2T;
3048         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3049         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3050                         (struct scsi_lun *)&hdr->lun);
3051         hdr->itt                = cmd->init_task_tag;
3052         r2t->targ_xfer_tag      = session_get_next_ttt(conn->sess);
3053         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3054         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3055         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3056         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3057         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3058         hdr->data_offset        = cpu_to_be32(r2t->offset);
3059         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3060
3061         cmd->iov_misc[0].iov_base       = cmd->pdu;
3062         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3063         tx_size += ISCSI_HDR_LEN;
3064
3065         if (conn->conn_ops->HeaderDigest) {
3066                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3067
3068                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3069                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3070
3071                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3072                 tx_size += ISCSI_CRC_LEN;
3073                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3074                         " PDU 0x%08x\n", *header_digest);
3075         }
3076
3077         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3078                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3079                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3080                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3081                         r2t->offset, r2t->xfer_len, conn->cid);
3082
3083         cmd->iov_misc_count = 1;
3084         cmd->tx_size = tx_size;
3085
3086         spin_lock_bh(&cmd->r2t_lock);
3087         r2t->sent_r2t = 1;
3088         spin_unlock_bh(&cmd->r2t_lock);
3089
3090         ret = iscsit_send_tx_data(cmd, conn, 1);
3091         if (ret < 0) {
3092                 iscsit_tx_thread_wait_for_tcp(conn);
3093                 return ret;
3094         }
3095
3096         spin_lock_bh(&cmd->dataout_timeout_lock);
3097         iscsit_start_dataout_timer(cmd, conn);
3098         spin_unlock_bh(&cmd->dataout_timeout_lock);
3099
3100         return 0;
3101 }
3102
3103 /*
3104  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3105  *              connection recovery.
3106  */
3107 int iscsit_build_r2ts_for_cmd(
3108         struct iscsi_conn *conn,
3109         struct iscsi_cmd *cmd,
3110         bool recovery)
3111 {
3112         int first_r2t = 1;
3113         u32 offset = 0, xfer_len = 0;
3114
3115         spin_lock_bh(&cmd->r2t_lock);
3116         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3117                 spin_unlock_bh(&cmd->r2t_lock);
3118                 return 0;
3119         }
3120
3121         if (conn->sess->sess_ops->DataSequenceInOrder &&
3122             !recovery)
3123                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3124
3125         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3126                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3127                         offset = cmd->r2t_offset;
3128
3129                         if (first_r2t && recovery) {
3130                                 int new_data_end = offset +
3131                                         conn->sess->sess_ops->MaxBurstLength -
3132                                         cmd->next_burst_len;
3133
3134                                 if (new_data_end > cmd->se_cmd.data_length)
3135                                         xfer_len = cmd->se_cmd.data_length - offset;
3136                                 else
3137                                         xfer_len =
3138                                                 conn->sess->sess_ops->MaxBurstLength -
3139                                                 cmd->next_burst_len;
3140                         } else {
3141                                 int new_data_end = offset +
3142                                         conn->sess->sess_ops->MaxBurstLength;
3143
3144                                 if (new_data_end > cmd->se_cmd.data_length)
3145                                         xfer_len = cmd->se_cmd.data_length - offset;
3146                                 else
3147                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3148                         }
3149                         cmd->r2t_offset += xfer_len;
3150
3151                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3152                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3153                 } else {
3154                         struct iscsi_seq *seq;
3155
3156                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3157                         if (!seq) {
3158                                 spin_unlock_bh(&cmd->r2t_lock);
3159                                 return -1;
3160                         }
3161
3162                         offset = seq->offset;
3163                         xfer_len = seq->xfer_len;
3164
3165                         if (cmd->seq_send_order == cmd->seq_count)
3166                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3167                 }
3168                 cmd->outstanding_r2ts++;
3169                 first_r2t = 0;
3170
3171                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3172                         spin_unlock_bh(&cmd->r2t_lock);
3173                         return -1;
3174                 }
3175
3176                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3177                         break;
3178         }
3179         spin_unlock_bh(&cmd->r2t_lock);
3180
3181         return 0;
3182 }
3183
3184 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3185                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3186 {
3187         if (inc_stat_sn)
3188                 cmd->stat_sn = conn->stat_sn++;
3189
3190         atomic_long_inc(&conn->sess->rsp_pdus);
3191
3192         memset(hdr, 0, ISCSI_HDR_LEN);
3193         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3194         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3195         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3196                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3197                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3198         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3199                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3200                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3201         }
3202         hdr->response           = cmd->iscsi_response;
3203         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3204         hdr->itt                = cmd->init_task_tag;
3205         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3206
3207         iscsit_increment_maxcmdsn(cmd, conn->sess);
3208         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3209         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3210
3211         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3212                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3213                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3214                 cmd->se_cmd.scsi_status, conn->cid);
3215 }
3216 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3217
3218 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3219 {
3220         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3221         struct kvec *iov;
3222         u32 padding = 0, tx_size = 0;
3223         int iov_count = 0;
3224         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3225
3226         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3227
3228         iov = &cmd->iov_misc[0];
3229         iov[iov_count].iov_base = cmd->pdu;
3230         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3231         tx_size += ISCSI_HDR_LEN;
3232
3233         /*
3234          * Attach SENSE DATA payload to iSCSI Response PDU
3235          */
3236         if (cmd->se_cmd.sense_buffer &&
3237            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3238             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3239                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3240                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3241
3242                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3243                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3244                 iov[iov_count].iov_base = cmd->sense_buffer;
3245                 iov[iov_count++].iov_len =
3246                                 (cmd->se_cmd.scsi_sense_length + padding);
3247                 tx_size += cmd->se_cmd.scsi_sense_length;
3248
3249                 if (padding) {
3250                         memset(cmd->sense_buffer +
3251                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3252                         tx_size += padding;
3253                         pr_debug("Adding %u bytes of padding to"
3254                                 " SENSE.\n", padding);
3255                 }
3256
3257                 if (conn->conn_ops->DataDigest) {
3258                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3259                                 cmd->sense_buffer,
3260                                 (cmd->se_cmd.scsi_sense_length + padding),
3261                                 0, NULL, (u8 *)&cmd->data_crc);
3262
3263                         iov[iov_count].iov_base    = &cmd->data_crc;
3264                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3265                         tx_size += ISCSI_CRC_LEN;
3266
3267                         pr_debug("Attaching CRC32 DataDigest for"
3268                                 " SENSE, %u bytes CRC 0x%08x\n",
3269                                 (cmd->se_cmd.scsi_sense_length + padding),
3270                                 cmd->data_crc);
3271                 }
3272
3273                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3274                                 " Response PDU\n",
3275                                 cmd->se_cmd.scsi_sense_length);
3276         }
3277
3278         if (conn->conn_ops->HeaderDigest) {
3279                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3280
3281                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3282                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3283
3284                 iov[0].iov_len += ISCSI_CRC_LEN;
3285                 tx_size += ISCSI_CRC_LEN;
3286                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3287                                 " PDU 0x%08x\n", *header_digest);
3288         }
3289
3290         cmd->iov_misc_count = iov_count;
3291         cmd->tx_size = tx_size;
3292
3293         return 0;
3294 }
3295
3296 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3297 {
3298         switch (se_tmr->response) {
3299         case TMR_FUNCTION_COMPLETE:
3300                 return ISCSI_TMF_RSP_COMPLETE;
3301         case TMR_TASK_DOES_NOT_EXIST:
3302                 return ISCSI_TMF_RSP_NO_TASK;
3303         case TMR_LUN_DOES_NOT_EXIST:
3304                 return ISCSI_TMF_RSP_NO_LUN;
3305         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3306                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
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
3393 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3394                                   enum iscsit_transport_type network_transport,
3395                                   int skip_bytes, bool *completed)
3396 {
3397         char *payload = NULL;
3398         struct iscsi_conn *conn = cmd->conn;
3399         struct iscsi_portal_group *tpg;
3400         struct iscsi_tiqn *tiqn;
3401         struct iscsi_tpg_np *tpg_np;
3402         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3403         int target_name_printed;
3404         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3405         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3406
3407         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3408                          SENDTARGETS_BUF_LIMIT);
3409
3410         payload = kzalloc(buffer_len, GFP_KERNEL);
3411         if (!payload) {
3412                 pr_err("Unable to allocate memory for sendtargets"
3413                                 " response.\n");
3414                 return -ENOMEM;
3415         }
3416         /*
3417          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3418          * explicit case..
3419          */
3420         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3421                 text_ptr = strchr(text_in, '=');
3422                 if (!text_ptr) {
3423                         pr_err("Unable to locate '=' string in text_in:"
3424                                " %s\n", text_in);
3425                         kfree(payload);
3426                         return -EINVAL;
3427                 }
3428                 /*
3429                  * Skip over '=' character..
3430                  */
3431                 text_ptr += 1;
3432         }
3433
3434         spin_lock(&tiqn_lock);
3435         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3436                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3437                      strcmp(tiqn->tiqn, text_ptr)) {
3438                         continue;
3439                 }
3440
3441                 target_name_printed = 0;
3442
3443                 spin_lock(&tiqn->tiqn_tpg_lock);
3444                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3445
3446                         /* If demo_mode_discovery=0 and generate_node_acls=0
3447                          * (demo mode dislabed) do not return
3448                          * TargetName+TargetAddress unless a NodeACL exists.
3449                          */
3450
3451                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3452                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3453                             (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3454                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3455                                 continue;
3456                         }
3457
3458                         spin_lock(&tpg->tpg_state_lock);
3459                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3460                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3461                                 spin_unlock(&tpg->tpg_state_lock);
3462                                 continue;
3463                         }
3464                         spin_unlock(&tpg->tpg_state_lock);
3465
3466                         spin_lock(&tpg->tpg_np_lock);
3467                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3468                                                 tpg_np_list) {
3469                                 struct iscsi_np *np = tpg_np->tpg_np;
3470                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3471                                 char *fmt_str;
3472
3473                                 if (np->np_network_transport != network_transport)
3474                                         continue;
3475
3476                                 if (!target_name_printed) {
3477                                         len = sprintf(buf, "TargetName=%s",
3478                                                       tiqn->tiqn);
3479                                         len += 1;
3480
3481                                         if ((len + payload_len) > buffer_len) {
3482                                                 spin_unlock(&tpg->tpg_np_lock);
3483                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3484                                                 end_of_buf = 1;
3485                                                 goto eob;
3486                                         }
3487
3488                                         if (skip_bytes && len <= skip_bytes) {
3489                                                 skip_bytes -= len;
3490                                         } else {
3491                                                 memcpy(payload + payload_len, buf, len);
3492                                                 payload_len += len;
3493                                                 target_name_printed = 1;
3494                                                 if (len > skip_bytes)
3495                                                         skip_bytes = 0;
3496                                         }
3497                                 }
3498
3499                                 if (np->np_sockaddr.ss_family == AF_INET6)
3500                                         fmt_str = "TargetAddress=[%s]:%hu,%hu";
3501                                 else
3502                                         fmt_str = "TargetAddress=%s:%hu,%hu";
3503
3504                                 len = sprintf(buf, fmt_str,
3505                                         inaddr_any ? conn->local_ip : np->np_ip,
3506                                         np->np_port,
3507                                         tpg->tpgt);
3508                                 len += 1;
3509
3510                                 if ((len + payload_len) > buffer_len) {
3511                                         spin_unlock(&tpg->tpg_np_lock);
3512                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3513                                         end_of_buf = 1;
3514                                         goto eob;
3515                                 }
3516
3517                                 if (skip_bytes && len <= skip_bytes) {
3518                                         skip_bytes -= len;
3519                                 } else {
3520                                         memcpy(payload + payload_len, buf, len);
3521                                         payload_len += len;
3522                                         if (len > skip_bytes)
3523                                                 skip_bytes = 0;
3524                                 }
3525                         }
3526                         spin_unlock(&tpg->tpg_np_lock);
3527                 }
3528                 spin_unlock(&tiqn->tiqn_tpg_lock);
3529 eob:
3530                 if (end_of_buf) {
3531                         *completed = false;
3532                         break;
3533                 }
3534
3535                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3536                         break;
3537         }
3538         spin_unlock(&tiqn_lock);
3539
3540         cmd->buf_ptr = payload;
3541
3542         return payload_len;
3543 }
3544
3545 int
3546 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3547                       struct iscsi_text_rsp *hdr,
3548                       enum iscsit_transport_type network_transport)
3549 {
3550         int text_length, padding;
3551         bool completed = true;
3552
3553         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3554                                                         cmd->read_data_done,
3555                                                         &completed);
3556         if (text_length < 0)
3557                 return text_length;
3558
3559         if (completed) {
3560                 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3561         } else {
3562                 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3563                 cmd->read_data_done += text_length;
3564                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3565                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3566         }
3567         hdr->opcode = ISCSI_OP_TEXT_RSP;
3568         padding = ((-text_length) & 3);
3569         hton24(hdr->dlength, text_length);
3570         hdr->itt = cmd->init_task_tag;
3571         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3572         cmd->stat_sn = conn->stat_sn++;
3573         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3574
3575         iscsit_increment_maxcmdsn(cmd, conn->sess);
3576         /*
3577          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3578          * correctly increment MaxCmdSN for each response answering a
3579          * non immediate text request with a valid CmdSN.
3580          */
3581         cmd->maxcmdsn_inc = 0;
3582         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3583         hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3584
3585         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3586                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3587                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3588                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3589                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3590
3591         return text_length + padding;
3592 }
3593 EXPORT_SYMBOL(iscsit_build_text_rsp);
3594
3595 static int iscsit_send_text_rsp(
3596         struct iscsi_cmd *cmd,
3597         struct iscsi_conn *conn)
3598 {
3599         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3600         struct kvec *iov;
3601         u32 tx_size = 0;
3602         int text_length, iov_count = 0, rc;
3603
3604         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP);
3605         if (rc < 0)
3606                 return rc;
3607
3608         text_length = rc;
3609         iov = &cmd->iov_misc[0];
3610         iov[iov_count].iov_base = cmd->pdu;
3611         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3612         iov[iov_count].iov_base = cmd->buf_ptr;
3613         iov[iov_count++].iov_len = text_length;
3614
3615         tx_size += (ISCSI_HDR_LEN + text_length);
3616
3617         if (conn->conn_ops->HeaderDigest) {
3618                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3619
3620                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3621                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3622
3623                 iov[0].iov_len += ISCSI_CRC_LEN;
3624                 tx_size += ISCSI_CRC_LEN;
3625                 pr_debug("Attaching CRC32 HeaderDigest for"
3626                         " Text Response PDU 0x%08x\n", *header_digest);
3627         }
3628
3629         if (conn->conn_ops->DataDigest) {
3630                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3631                                 cmd->buf_ptr, text_length,
3632                                 0, NULL, (u8 *)&cmd->data_crc);
3633
3634                 iov[iov_count].iov_base = &cmd->data_crc;
3635                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3636                 tx_size += ISCSI_CRC_LEN;
3637
3638                 pr_debug("Attaching DataDigest for %u bytes of text"
3639                         " data, CRC 0x%08x\n", text_length,
3640                         cmd->data_crc);
3641         }
3642
3643         cmd->iov_misc_count = iov_count;
3644         cmd->tx_size = tx_size;
3645
3646         return 0;
3647 }
3648
3649 void
3650 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3651                     struct iscsi_reject *hdr)
3652 {
3653         hdr->opcode             = ISCSI_OP_REJECT;
3654         hdr->reason             = cmd->reject_reason;
3655         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3656         hton24(hdr->dlength, ISCSI_HDR_LEN);
3657         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3658         cmd->stat_sn            = conn->stat_sn++;
3659         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3660         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3661         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3662
3663 }
3664 EXPORT_SYMBOL(iscsit_build_reject);
3665
3666 static int iscsit_send_reject(
3667         struct iscsi_cmd *cmd,
3668         struct iscsi_conn *conn)
3669 {
3670         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3671         struct kvec *iov;
3672         u32 iov_count = 0, tx_size;
3673
3674         iscsit_build_reject(cmd, conn, hdr);
3675
3676         iov = &cmd->iov_misc[0];
3677         iov[iov_count].iov_base = cmd->pdu;
3678         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3679         iov[iov_count].iov_base = cmd->buf_ptr;
3680         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3681
3682         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3683
3684         if (conn->conn_ops->HeaderDigest) {
3685                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3686
3687                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3688                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3689
3690                 iov[0].iov_len += ISCSI_CRC_LEN;
3691                 tx_size += ISCSI_CRC_LEN;
3692                 pr_debug("Attaching CRC32 HeaderDigest for"
3693                         " REJECT PDU 0x%08x\n", *header_digest);
3694         }
3695
3696         if (conn->conn_ops->DataDigest) {
3697                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3698                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3699
3700                 iov[iov_count].iov_base = &cmd->data_crc;
3701                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3702                 tx_size += ISCSI_CRC_LEN;
3703                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3704                                 " PDU 0x%08x\n", cmd->data_crc);
3705         }
3706
3707         cmd->iov_misc_count = iov_count;
3708         cmd->tx_size = tx_size;
3709
3710         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3711                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3712
3713         return 0;
3714 }
3715
3716 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3717 {
3718         struct iscsi_thread_set *ts = conn->thread_set;
3719         int ord, cpu;
3720         /*
3721          * thread_id is assigned from iscsit_global->ts_bitmap from
3722          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3723          *
3724          * Here we use thread_id to determine which CPU that this
3725          * iSCSI connection's iscsi_thread_set will be scheduled to
3726          * execute upon.
3727          */
3728         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3729         for_each_online_cpu(cpu) {
3730                 if (ord-- == 0) {
3731                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3732                         return;
3733                 }
3734         }
3735         /*
3736          * This should never be reached..
3737          */
3738         dump_stack();
3739         cpumask_setall(conn->conn_cpumask);
3740 }
3741
3742 static inline void iscsit_thread_check_cpumask(
3743         struct iscsi_conn *conn,
3744         struct task_struct *p,
3745         int mode)
3746 {
3747         /*
3748          * mode == 1 signals iscsi_target_tx_thread() usage.
3749          * mode == 0 signals iscsi_target_rx_thread() usage.
3750          */
3751         if (mode == 1) {
3752                 if (!conn->conn_tx_reset_cpumask)
3753                         return;
3754                 conn->conn_tx_reset_cpumask = 0;
3755         } else {
3756                 if (!conn->conn_rx_reset_cpumask)
3757                         return;
3758                 conn->conn_rx_reset_cpumask = 0;
3759         }
3760         /*
3761          * Update the CPU mask for this single kthread so that
3762          * both TX and RX kthreads are scheduled to run on the
3763          * same CPU.
3764          */
3765         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3766 }
3767
3768 static int
3769 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3770 {
3771         int ret;
3772
3773         switch (state) {
3774         case ISTATE_SEND_R2T:
3775                 ret = iscsit_send_r2t(cmd, conn);
3776                 if (ret < 0)
3777                         goto err;
3778                 break;
3779         case ISTATE_REMOVE:
3780                 spin_lock_bh(&conn->cmd_lock);
3781                 list_del_init(&cmd->i_conn_node);
3782                 spin_unlock_bh(&conn->cmd_lock);
3783
3784                 iscsit_free_cmd(cmd, false);
3785                 break;
3786         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3787                 iscsit_mod_nopin_response_timer(conn);
3788                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3789                 if (ret < 0)
3790                         goto err;
3791                 break;
3792         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3793                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3794                 if (ret < 0)
3795                         goto err;
3796                 break;
3797         default:
3798                 pr_err("Unknown Opcode: 0x%02x ITT:"
3799                        " 0x%08x, i_state: %d on CID: %hu\n",
3800                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3801                        conn->cid);
3802                 goto err;
3803         }
3804
3805         return 0;
3806
3807 err:
3808         return -1;
3809 }
3810
3811 static int
3812 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3813 {
3814         struct iscsit_transport *t = conn->conn_transport;
3815         struct iscsi_queue_req *qr;
3816         struct iscsi_cmd *cmd;
3817         u8 state;
3818         int ret;
3819
3820         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3821                 atomic_set(&conn->check_immediate_queue, 0);
3822                 cmd = qr->cmd;
3823                 state = qr->state;
3824                 kmem_cache_free(lio_qr_cache, qr);
3825
3826                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3827                 if (ret < 0)
3828                         return ret;
3829         }
3830
3831         return 0;
3832 }
3833
3834 static int
3835 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3836 {
3837         int ret;
3838
3839 check_rsp_state:
3840         switch (state) {
3841         case ISTATE_SEND_DATAIN:
3842                 ret = iscsit_send_datain(cmd, conn);
3843                 if (ret < 0)
3844                         goto err;
3845                 else if (!ret)
3846                         /* more drs */
3847                         goto check_rsp_state;
3848                 else if (ret == 1) {
3849                         /* all done */
3850                         spin_lock_bh(&cmd->istate_lock);
3851                         cmd->i_state = ISTATE_SENT_STATUS;
3852                         spin_unlock_bh(&cmd->istate_lock);
3853
3854                         if (atomic_read(&conn->check_immediate_queue))
3855                                 return 1;
3856
3857                         return 0;
3858                 } else if (ret == 2) {
3859                         /* Still must send status,
3860                            SCF_TRANSPORT_TASK_SENSE was set */
3861                         spin_lock_bh(&cmd->istate_lock);
3862                         cmd->i_state = ISTATE_SEND_STATUS;
3863                         spin_unlock_bh(&cmd->istate_lock);
3864                         state = ISTATE_SEND_STATUS;
3865                         goto check_rsp_state;
3866                 }
3867
3868                 break;
3869         case ISTATE_SEND_STATUS:
3870         case ISTATE_SEND_STATUS_RECOVERY:
3871                 ret = iscsit_send_response(cmd, conn);
3872                 break;
3873         case ISTATE_SEND_LOGOUTRSP:
3874                 ret = iscsit_send_logout(cmd, conn);
3875                 break;
3876         case ISTATE_SEND_ASYNCMSG:
3877                 ret = iscsit_send_conn_drop_async_message(
3878                         cmd, conn);
3879                 break;
3880         case ISTATE_SEND_NOPIN:
3881                 ret = iscsit_send_nopin(cmd, conn);
3882                 break;
3883         case ISTATE_SEND_REJECT:
3884                 ret = iscsit_send_reject(cmd, conn);
3885                 break;
3886         case ISTATE_SEND_TASKMGTRSP:
3887                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3888                 if (ret != 0)
3889                         break;
3890                 ret = iscsit_tmr_post_handler(cmd, conn);
3891                 if (ret != 0)
3892                         iscsit_fall_back_to_erl0(conn->sess);
3893                 break;
3894         case ISTATE_SEND_TEXTRSP:
3895                 ret = iscsit_send_text_rsp(cmd, conn);
3896                 break;
3897         default:
3898                 pr_err("Unknown Opcode: 0x%02x ITT:"
3899                        " 0x%08x, i_state: %d on CID: %hu\n",
3900                        cmd->iscsi_opcode, cmd->init_task_tag,
3901                        state, conn->cid);
3902                 goto err;
3903         }
3904         if (ret < 0)
3905                 goto err;
3906
3907         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3908                 iscsit_tx_thread_wait_for_tcp(conn);
3909                 iscsit_unmap_iovec(cmd);
3910                 goto err;
3911         }
3912         iscsit_unmap_iovec(cmd);
3913
3914         switch (state) {
3915         case ISTATE_SEND_LOGOUTRSP:
3916                 if (!iscsit_logout_post_handler(cmd, conn))
3917                         goto restart;
3918                 /* fall through */
3919         case ISTATE_SEND_STATUS:
3920         case ISTATE_SEND_ASYNCMSG:
3921         case ISTATE_SEND_NOPIN:
3922         case ISTATE_SEND_STATUS_RECOVERY:
3923         case ISTATE_SEND_TEXTRSP:
3924         case ISTATE_SEND_TASKMGTRSP:
3925         case ISTATE_SEND_REJECT:
3926                 spin_lock_bh(&cmd->istate_lock);
3927                 cmd->i_state = ISTATE_SENT_STATUS;
3928                 spin_unlock_bh(&cmd->istate_lock);
3929                 break;
3930         default:
3931                 pr_err("Unknown Opcode: 0x%02x ITT:"
3932                        " 0x%08x, i_state: %d on CID: %hu\n",
3933                        cmd->iscsi_opcode, cmd->init_task_tag,
3934                        cmd->i_state, conn->cid);
3935                 goto err;
3936         }
3937
3938         if (atomic_read(&conn->check_immediate_queue))
3939                 return 1;
3940
3941         return 0;
3942
3943 err:
3944         return -1;
3945 restart:
3946         return -EAGAIN;
3947 }
3948
3949 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3950 {
3951         struct iscsit_transport *t = conn->conn_transport;
3952         struct iscsi_queue_req *qr;
3953         struct iscsi_cmd *cmd;
3954         u8 state;
3955         int ret;
3956
3957         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3958                 cmd = qr->cmd;
3959                 state = qr->state;
3960                 kmem_cache_free(lio_qr_cache, qr);
3961
3962                 ret = t->iscsit_response_queue(conn, cmd, state);
3963                 if (ret == 1 || ret < 0)
3964                         return ret;
3965         }
3966
3967         return 0;
3968 }
3969
3970 int iscsi_target_tx_thread(void *arg)
3971 {
3972         int ret = 0;
3973         struct iscsi_conn *conn;
3974         struct iscsi_thread_set *ts = arg;
3975         /*
3976          * Allow ourselves to be interrupted by SIGINT so that a
3977          * connection recovery / failure event can be triggered externally.
3978          */
3979         allow_signal(SIGINT);
3980
3981 restart:
3982         conn = iscsi_tx_thread_pre_handler(ts);
3983         if (!conn)
3984                 goto out;
3985
3986         ret = 0;
3987
3988         while (!kthread_should_stop()) {
3989                 /*
3990                  * Ensure that both TX and RX per connection kthreads
3991                  * are scheduled to run on the same CPU.
3992                  */
3993                 iscsit_thread_check_cpumask(conn, current, 1);
3994
3995                 wait_event_interruptible(conn->queues_wq,
3996                                          !iscsit_conn_all_queues_empty(conn) ||
3997                                          ts->status == ISCSI_THREAD_SET_RESET);
3998
3999                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
4000                      signal_pending(current))
4001                         goto transport_err;
4002
4003 get_immediate:
4004                 ret = iscsit_handle_immediate_queue(conn);
4005                 if (ret < 0)
4006                         goto transport_err;
4007
4008                 ret = iscsit_handle_response_queue(conn);
4009                 if (ret == 1)
4010                         goto get_immediate;
4011                 else if (ret == -EAGAIN)
4012                         goto restart;
4013                 else if (ret < 0)
4014                         goto transport_err;
4015         }
4016
4017 transport_err:
4018         iscsit_take_action_for_connection_exit(conn);
4019         goto restart;
4020 out:
4021         return 0;
4022 }
4023
4024 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
4025 {
4026         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
4027         struct iscsi_cmd *cmd;
4028         int ret = 0;
4029
4030         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
4031         case ISCSI_OP_SCSI_CMD:
4032                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4033                 if (!cmd)
4034                         goto reject;
4035
4036                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
4037                 break;
4038         case ISCSI_OP_SCSI_DATA_OUT:
4039                 ret = iscsit_handle_data_out(conn, buf);
4040                 break;
4041         case ISCSI_OP_NOOP_OUT:
4042                 cmd = NULL;
4043                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
4044                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4045                         if (!cmd)
4046                                 goto reject;
4047                 }
4048                 ret = iscsit_handle_nop_out(conn, cmd, buf);
4049                 break;
4050         case ISCSI_OP_SCSI_TMFUNC:
4051                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4052                 if (!cmd)
4053                         goto reject;
4054
4055                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4056                 break;
4057         case ISCSI_OP_TEXT:
4058                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
4059                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
4060                         if (!cmd)
4061                                 goto reject;
4062                 } else {
4063                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4064                         if (!cmd)
4065                                 goto reject;
4066                 }
4067
4068                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4069                 break;
4070         case ISCSI_OP_LOGOUT:
4071                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4072                 if (!cmd)
4073                         goto reject;
4074
4075                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4076                 if (ret > 0)
4077                         wait_for_completion_timeout(&conn->conn_logout_comp,
4078                                         SECONDS_FOR_LOGOUT_COMP * HZ);
4079                 break;
4080         case ISCSI_OP_SNACK:
4081                 ret = iscsit_handle_snack(conn, buf);
4082                 break;
4083         default:
4084                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4085                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4086                         pr_err("Cannot recover from unknown"
4087                         " opcode while ERL=0, closing iSCSI connection.\n");
4088                         return -1;
4089                 }
4090                 if (!conn->conn_ops->OFMarker) {
4091                         pr_err("Unable to recover from unknown"
4092                         " opcode while OFMarker=No, closing iSCSI"
4093                                 " connection.\n");
4094                         return -1;
4095                 }
4096                 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4097                         pr_err("Unable to recover from unknown"
4098                                 " opcode, closing iSCSI connection.\n");
4099                         return -1;
4100                 }
4101                 break;
4102         }
4103
4104         return ret;
4105 reject:
4106         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4107 }
4108
4109 int iscsi_target_rx_thread(void *arg)
4110 {
4111         int ret;
4112         u8 buffer[ISCSI_HDR_LEN], opcode;
4113         u32 checksum = 0, digest = 0;
4114         struct iscsi_conn *conn = NULL;
4115         struct iscsi_thread_set *ts = arg;
4116         struct kvec iov;
4117         /*
4118          * Allow ourselves to be interrupted by SIGINT so that a
4119          * connection recovery / failure event can be triggered externally.
4120          */
4121         allow_signal(SIGINT);
4122
4123 restart:
4124         conn = iscsi_rx_thread_pre_handler(ts);
4125         if (!conn)
4126                 goto out;
4127
4128         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4129                 struct completion comp;
4130                 int rc;
4131
4132                 init_completion(&comp);
4133                 rc = wait_for_completion_interruptible(&comp);
4134                 if (rc < 0)
4135                         goto transport_err;
4136
4137                 goto out;
4138         }
4139
4140         while (!kthread_should_stop()) {
4141                 /*
4142                  * Ensure that both TX and RX per connection kthreads
4143                  * are scheduled to run on the same CPU.
4144                  */
4145                 iscsit_thread_check_cpumask(conn, current, 0);
4146
4147                 memset(buffer, 0, ISCSI_HDR_LEN);
4148                 memset(&iov, 0, sizeof(struct kvec));
4149
4150                 iov.iov_base    = buffer;
4151                 iov.iov_len     = ISCSI_HDR_LEN;
4152
4153                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4154                 if (ret != ISCSI_HDR_LEN) {
4155                         iscsit_rx_thread_wait_for_tcp(conn);
4156                         goto transport_err;
4157                 }
4158
4159                 if (conn->conn_ops->HeaderDigest) {
4160                         iov.iov_base    = &digest;
4161                         iov.iov_len     = ISCSI_CRC_LEN;
4162
4163                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4164                         if (ret != ISCSI_CRC_LEN) {
4165                                 iscsit_rx_thread_wait_for_tcp(conn);
4166                                 goto transport_err;
4167                         }
4168
4169                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4170                                         buffer, ISCSI_HDR_LEN,
4171                                         0, NULL, (u8 *)&checksum);
4172
4173                         if (digest != checksum) {
4174                                 pr_err("HeaderDigest CRC32C failed,"
4175                                         " received 0x%08x, computed 0x%08x\n",
4176                                         digest, checksum);
4177                                 /*
4178                                  * Set the PDU to 0xff so it will intentionally
4179                                  * hit default in the switch below.
4180                                  */
4181                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4182                                 atomic_long_inc(&conn->sess->conn_digest_errors);
4183                         } else {
4184                                 pr_debug("Got HeaderDigest CRC32C"
4185                                                 " 0x%08x\n", checksum);
4186                         }
4187                 }
4188
4189                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4190                         goto transport_err;
4191
4192                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4193
4194                 if (conn->sess->sess_ops->SessionType &&
4195                    ((!(opcode & ISCSI_OP_TEXT)) ||
4196                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4197                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4198                         " while in Discovery Session, rejecting.\n", opcode);
4199                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4200                                           buffer);
4201                         goto transport_err;
4202                 }
4203
4204                 ret = iscsi_target_rx_opcode(conn, buffer);
4205                 if (ret < 0)
4206                         goto transport_err;
4207         }
4208
4209 transport_err:
4210         if (!signal_pending(current))
4211                 atomic_set(&conn->transport_failed, 1);
4212         iscsit_take_action_for_connection_exit(conn);
4213         goto restart;
4214 out:
4215         return 0;
4216 }
4217
4218 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4219 {
4220         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4221         struct iscsi_session *sess = conn->sess;
4222         /*
4223          * We expect this function to only ever be called from either RX or TX
4224          * thread context via iscsit_close_connection() once the other context
4225          * has been reset -> returned sleeping pre-handler state.
4226          */
4227         spin_lock_bh(&conn->cmd_lock);
4228         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4229
4230                 list_del_init(&cmd->i_conn_node);
4231                 spin_unlock_bh(&conn->cmd_lock);
4232
4233                 iscsit_increment_maxcmdsn(cmd, sess);
4234
4235                 iscsit_free_cmd(cmd, true);
4236
4237                 spin_lock_bh(&conn->cmd_lock);
4238         }
4239         spin_unlock_bh(&conn->cmd_lock);
4240 }
4241
4242 static void iscsit_stop_timers_for_cmds(
4243         struct iscsi_conn *conn)
4244 {
4245         struct iscsi_cmd *cmd;
4246
4247         spin_lock_bh(&conn->cmd_lock);
4248         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4249                 if (cmd->data_direction == DMA_TO_DEVICE)
4250                         iscsit_stop_dataout_timer(cmd);
4251         }
4252         spin_unlock_bh(&conn->cmd_lock);
4253 }
4254
4255 int iscsit_close_connection(
4256         struct iscsi_conn *conn)
4257 {
4258         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4259         struct iscsi_session    *sess = conn->sess;
4260
4261         pr_debug("Closing iSCSI connection CID %hu on SID:"
4262                 " %u\n", conn->cid, sess->sid);
4263         /*
4264          * Always up conn_logout_comp for the traditional TCP case just in case
4265          * the RX Thread in iscsi_target_rx_opcode() is sleeping and the logout
4266          * response never got sent because the connection failed.
4267          *
4268          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4269          * to signal logout response TX interrupt completion.  Go ahead and skip
4270          * this for iser since isert_rx_opcode() does not wait on logout failure,
4271          * and to avoid iscsi_conn pointer dereference in iser-target code.
4272          */
4273         if (conn->conn_transport->transport_type == ISCSI_TCP)
4274                 complete(&conn->conn_logout_comp);
4275
4276         iscsi_release_thread_set(conn);
4277
4278         iscsit_stop_timers_for_cmds(conn);
4279         iscsit_stop_nopin_response_timer(conn);
4280         iscsit_stop_nopin_timer(conn);
4281
4282         if (conn->conn_transport->iscsit_wait_conn)
4283                 conn->conn_transport->iscsit_wait_conn(conn);
4284
4285         /*
4286          * During Connection recovery drop unacknowledged out of order
4287          * commands for this connection, and prepare the other commands
4288          * for realligence.
4289          *
4290          * During normal operation clear the out of order commands (but
4291          * do not free the struct iscsi_ooo_cmdsn's) and release all
4292          * struct iscsi_cmds.
4293          */
4294         if (atomic_read(&conn->connection_recovery)) {
4295                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4296                 iscsit_prepare_cmds_for_realligance(conn);
4297         } else {
4298                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4299                 iscsit_release_commands_from_conn(conn);
4300         }
4301         iscsit_free_queue_reqs_for_conn(conn);
4302
4303         /*
4304          * Handle decrementing session or connection usage count if
4305          * a logout response was not able to be sent because the
4306          * connection failed.  Fall back to Session Recovery here.
4307          */
4308         if (atomic_read(&conn->conn_logout_remove)) {
4309                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4310                         iscsit_dec_conn_usage_count(conn);
4311                         iscsit_dec_session_usage_count(sess);
4312                 }
4313                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4314                         iscsit_dec_conn_usage_count(conn);
4315
4316                 atomic_set(&conn->conn_logout_remove, 0);
4317                 atomic_set(&sess->session_reinstatement, 0);
4318                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4319         }
4320
4321         spin_lock_bh(&sess->conn_lock);
4322         list_del(&conn->conn_list);
4323
4324         /*
4325          * Attempt to let the Initiator know this connection failed by
4326          * sending an Connection Dropped Async Message on another
4327          * active connection.
4328          */
4329         if (atomic_read(&conn->connection_recovery))
4330                 iscsit_build_conn_drop_async_message(conn);
4331
4332         spin_unlock_bh(&sess->conn_lock);
4333
4334         /*
4335          * If connection reinstatement is being performed on this connection,
4336          * up the connection reinstatement semaphore that is being blocked on
4337          * in iscsit_cause_connection_reinstatement().
4338          */
4339         spin_lock_bh(&conn->state_lock);
4340         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4341                 spin_unlock_bh(&conn->state_lock);
4342                 complete(&conn->conn_wait_comp);
4343                 wait_for_completion(&conn->conn_post_wait_comp);
4344                 spin_lock_bh(&conn->state_lock);
4345         }
4346
4347         /*
4348          * If connection reinstatement is being performed on this connection
4349          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4350          * connection wait rcfr semaphore that is being blocked on
4351          * an iscsit_connection_reinstatement_rcfr().
4352          */
4353         if (atomic_read(&conn->connection_wait_rcfr)) {
4354                 spin_unlock_bh(&conn->state_lock);
4355                 complete(&conn->conn_wait_rcfr_comp);
4356                 wait_for_completion(&conn->conn_post_wait_comp);
4357                 spin_lock_bh(&conn->state_lock);
4358         }
4359         atomic_set(&conn->connection_reinstatement, 1);
4360         spin_unlock_bh(&conn->state_lock);
4361
4362         /*
4363          * If any other processes are accessing this connection pointer we
4364          * must wait until they have completed.
4365          */
4366         iscsit_check_conn_usage_count(conn);
4367
4368         if (conn->conn_rx_hash.tfm)
4369                 crypto_free_hash(conn->conn_rx_hash.tfm);
4370         if (conn->conn_tx_hash.tfm)
4371                 crypto_free_hash(conn->conn_tx_hash.tfm);
4372
4373         free_cpumask_var(conn->conn_cpumask);
4374
4375         kfree(conn->conn_ops);
4376         conn->conn_ops = NULL;
4377
4378         if (conn->sock)
4379                 sock_release(conn->sock);
4380
4381         if (conn->conn_transport->iscsit_free_conn)
4382                 conn->conn_transport->iscsit_free_conn(conn);
4383
4384         iscsit_put_transport(conn->conn_transport);
4385
4386         conn->thread_set = NULL;
4387
4388         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4389         conn->conn_state = TARG_CONN_STATE_FREE;
4390         kfree(conn);
4391
4392         spin_lock_bh(&sess->conn_lock);
4393         atomic_dec(&sess->nconn);
4394         pr_debug("Decremented iSCSI connection count to %hu from node:"
4395                 " %s\n", atomic_read(&sess->nconn),
4396                 sess->sess_ops->InitiatorName);
4397         /*
4398          * Make sure that if one connection fails in an non ERL=2 iSCSI
4399          * Session that they all fail.
4400          */
4401         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4402              !atomic_read(&sess->session_logout))
4403                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4404
4405         /*
4406          * If this was not the last connection in the session, and we are
4407          * performing session reinstatement or falling back to ERL=0, call
4408          * iscsit_stop_session() without sleeping to shutdown the other
4409          * active connections.
4410          */
4411         if (atomic_read(&sess->nconn)) {
4412                 if (!atomic_read(&sess->session_reinstatement) &&
4413                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4414                         spin_unlock_bh(&sess->conn_lock);
4415                         return 0;
4416                 }
4417                 if (!atomic_read(&sess->session_stop_active)) {
4418                         atomic_set(&sess->session_stop_active, 1);
4419                         spin_unlock_bh(&sess->conn_lock);
4420                         iscsit_stop_session(sess, 0, 0);
4421                         return 0;
4422                 }
4423                 spin_unlock_bh(&sess->conn_lock);
4424                 return 0;
4425         }
4426
4427         /*
4428          * If this was the last connection in the session and one of the
4429          * following is occurring:
4430          *
4431          * Session Reinstatement is not being performed, and are falling back
4432          * to ERL=0 call iscsit_close_session().
4433          *
4434          * Session Logout was requested.  iscsit_close_session() will be called
4435          * elsewhere.
4436          *
4437          * Session Continuation is not being performed, start the Time2Retain
4438          * handler and check if sleep_on_sess_wait_sem is active.
4439          */
4440         if (!atomic_read(&sess->session_reinstatement) &&
4441              atomic_read(&sess->session_fall_back_to_erl0)) {
4442                 spin_unlock_bh(&sess->conn_lock);
4443                 target_put_session(sess->se_sess);
4444
4445                 return 0;
4446         } else if (atomic_read(&sess->session_logout)) {
4447                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4448                 sess->session_state = TARG_SESS_STATE_FREE;
4449                 spin_unlock_bh(&sess->conn_lock);
4450
4451                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4452                         complete(&sess->session_wait_comp);
4453
4454                 return 0;
4455         } else {
4456                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4457                 sess->session_state = TARG_SESS_STATE_FAILED;
4458
4459                 if (!atomic_read(&sess->session_continuation)) {
4460                         spin_unlock_bh(&sess->conn_lock);
4461                         iscsit_start_time2retain_handler(sess);
4462                 } else
4463                         spin_unlock_bh(&sess->conn_lock);
4464
4465                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4466                         complete(&sess->session_wait_comp);
4467
4468                 return 0;
4469         }
4470         spin_unlock_bh(&sess->conn_lock);
4471
4472         return 0;
4473 }
4474
4475 int iscsit_close_session(struct iscsi_session *sess)
4476 {
4477         struct iscsi_portal_group *tpg = sess->tpg;
4478         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4479
4480         if (atomic_read(&sess->nconn)) {
4481                 pr_err("%d connection(s) still exist for iSCSI session"
4482                         " to %s\n", atomic_read(&sess->nconn),
4483                         sess->sess_ops->InitiatorName);
4484                 BUG();
4485         }
4486
4487         spin_lock_bh(&se_tpg->session_lock);
4488         atomic_set(&sess->session_logout, 1);
4489         atomic_set(&sess->session_reinstatement, 1);
4490         iscsit_stop_time2retain_timer(sess);
4491         spin_unlock_bh(&se_tpg->session_lock);
4492
4493         /*
4494          * transport_deregister_session_configfs() will clear the
4495          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4496          * can be setting it again with __transport_register_session() in
4497          * iscsi_post_login_handler() again after the iscsit_stop_session()
4498          * completes in iscsi_np context.
4499          */
4500         transport_deregister_session_configfs(sess->se_sess);
4501
4502         /*
4503          * If any other processes are accessing this session pointer we must
4504          * wait until they have completed.  If we are in an interrupt (the
4505          * time2retain handler) and contain and active session usage count we
4506          * restart the timer and exit.
4507          */
4508         if (!in_interrupt()) {
4509                 if (iscsit_check_session_usage_count(sess) == 1)
4510                         iscsit_stop_session(sess, 1, 1);
4511         } else {
4512                 if (iscsit_check_session_usage_count(sess) == 2) {
4513                         atomic_set(&sess->session_logout, 0);
4514                         iscsit_start_time2retain_handler(sess);
4515                         return 0;
4516                 }
4517         }
4518
4519         transport_deregister_session(sess->se_sess);
4520
4521         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4522                 iscsit_free_connection_recovery_entires(sess);
4523
4524         iscsit_free_all_ooo_cmdsns(sess);
4525
4526         spin_lock_bh(&se_tpg->session_lock);
4527         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4528         sess->session_state = TARG_SESS_STATE_FREE;
4529         pr_debug("Released iSCSI session from node: %s\n",
4530                         sess->sess_ops->InitiatorName);
4531         tpg->nsessions--;
4532         if (tpg->tpg_tiqn)
4533                 tpg->tpg_tiqn->tiqn_nsessions--;
4534
4535         pr_debug("Decremented number of active iSCSI Sessions on"
4536                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4537
4538         spin_lock(&sess_idr_lock);
4539         idr_remove(&sess_idr, sess->session_index);
4540         spin_unlock(&sess_idr_lock);
4541
4542         kfree(sess->sess_ops);
4543         sess->sess_ops = NULL;
4544         spin_unlock_bh(&se_tpg->session_lock);
4545
4546         kfree(sess);
4547         return 0;
4548 }
4549
4550 static void iscsit_logout_post_handler_closesession(
4551         struct iscsi_conn *conn)
4552 {
4553         struct iscsi_session *sess = conn->sess;
4554
4555         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4556         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4557
4558         atomic_set(&conn->conn_logout_remove, 0);
4559         complete(&conn->conn_logout_comp);
4560
4561         iscsit_dec_conn_usage_count(conn);
4562         iscsit_stop_session(sess, 1, 1);
4563         iscsit_dec_session_usage_count(sess);
4564         target_put_session(sess->se_sess);
4565 }
4566
4567 static void iscsit_logout_post_handler_samecid(
4568         struct iscsi_conn *conn)
4569 {
4570         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4571         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4572
4573         atomic_set(&conn->conn_logout_remove, 0);
4574         complete(&conn->conn_logout_comp);
4575
4576         iscsit_cause_connection_reinstatement(conn, 1);
4577         iscsit_dec_conn_usage_count(conn);
4578 }
4579
4580 static void iscsit_logout_post_handler_diffcid(
4581         struct iscsi_conn *conn,
4582         u16 cid)
4583 {
4584         struct iscsi_conn *l_conn;
4585         struct iscsi_session *sess = conn->sess;
4586         bool conn_found = false;
4587
4588         if (!sess)
4589                 return;
4590
4591         spin_lock_bh(&sess->conn_lock);
4592         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4593                 if (l_conn->cid == cid) {
4594                         iscsit_inc_conn_usage_count(l_conn);
4595                         conn_found = true;
4596                         break;
4597                 }
4598         }
4599         spin_unlock_bh(&sess->conn_lock);
4600
4601         if (!conn_found)
4602                 return;
4603
4604         if (l_conn->sock)
4605                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4606
4607         spin_lock_bh(&l_conn->state_lock);
4608         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4609         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4610         spin_unlock_bh(&l_conn->state_lock);
4611
4612         iscsit_cause_connection_reinstatement(l_conn, 1);
4613         iscsit_dec_conn_usage_count(l_conn);
4614 }
4615
4616 /*
4617  *      Return of 0 causes the TX thread to restart.
4618  */
4619 int iscsit_logout_post_handler(
4620         struct iscsi_cmd *cmd,
4621         struct iscsi_conn *conn)
4622 {
4623         int ret = 0;
4624
4625         switch (cmd->logout_reason) {
4626         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4627                 switch (cmd->logout_response) {
4628                 case ISCSI_LOGOUT_SUCCESS:
4629                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4630                 default:
4631                         iscsit_logout_post_handler_closesession(conn);
4632                         break;
4633                 }
4634                 ret = 0;
4635                 break;
4636         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4637                 if (conn->cid == cmd->logout_cid) {
4638                         switch (cmd->logout_response) {
4639                         case ISCSI_LOGOUT_SUCCESS:
4640                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4641                         default:
4642                                 iscsit_logout_post_handler_samecid(conn);
4643                                 break;
4644                         }
4645                         ret = 0;
4646                 } else {
4647                         switch (cmd->logout_response) {
4648                         case ISCSI_LOGOUT_SUCCESS:
4649                                 iscsit_logout_post_handler_diffcid(conn,
4650                                         cmd->logout_cid);
4651                                 break;
4652                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4653                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4654                         default:
4655                                 break;
4656                         }
4657                         ret = 1;
4658                 }
4659                 break;
4660         case ISCSI_LOGOUT_REASON_RECOVERY:
4661                 switch (cmd->logout_response) {
4662                 case ISCSI_LOGOUT_SUCCESS:
4663                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4664                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4665                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4666                 default:
4667                         break;
4668                 }
4669                 ret = 1;
4670                 break;
4671         default:
4672                 break;
4673
4674         }
4675         return ret;
4676 }
4677 EXPORT_SYMBOL(iscsit_logout_post_handler);
4678
4679 void iscsit_fail_session(struct iscsi_session *sess)
4680 {
4681         struct iscsi_conn *conn;
4682
4683         spin_lock_bh(&sess->conn_lock);
4684         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4685                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4686                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4687         }
4688         spin_unlock_bh(&sess->conn_lock);
4689
4690         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4691         sess->session_state = TARG_SESS_STATE_FAILED;
4692 }
4693
4694 int iscsit_free_session(struct iscsi_session *sess)
4695 {
4696         u16 conn_count = atomic_read(&sess->nconn);
4697         struct iscsi_conn *conn, *conn_tmp = NULL;
4698         int is_last;
4699
4700         spin_lock_bh(&sess->conn_lock);
4701         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4702
4703         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4704                         conn_list) {
4705                 if (conn_count == 0)
4706                         break;
4707
4708                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4709                         is_last = 1;
4710                 } else {
4711                         iscsit_inc_conn_usage_count(conn_tmp);
4712                         is_last = 0;
4713                 }
4714                 iscsit_inc_conn_usage_count(conn);
4715
4716                 spin_unlock_bh(&sess->conn_lock);
4717                 iscsit_cause_connection_reinstatement(conn, 1);
4718                 spin_lock_bh(&sess->conn_lock);
4719
4720                 iscsit_dec_conn_usage_count(conn);
4721                 if (is_last == 0)
4722                         iscsit_dec_conn_usage_count(conn_tmp);
4723
4724                 conn_count--;
4725         }
4726
4727         if (atomic_read(&sess->nconn)) {
4728                 spin_unlock_bh(&sess->conn_lock);
4729                 wait_for_completion(&sess->session_wait_comp);
4730         } else
4731                 spin_unlock_bh(&sess->conn_lock);
4732
4733         target_put_session(sess->se_sess);
4734         return 0;
4735 }
4736
4737 void iscsit_stop_session(
4738         struct iscsi_session *sess,
4739         int session_sleep,
4740         int connection_sleep)
4741 {
4742         u16 conn_count = atomic_read(&sess->nconn);
4743         struct iscsi_conn *conn, *conn_tmp = NULL;
4744         int is_last;
4745
4746         spin_lock_bh(&sess->conn_lock);
4747         if (session_sleep)
4748                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4749
4750         if (connection_sleep) {
4751                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4752                                 conn_list) {
4753                         if (conn_count == 0)
4754                                 break;
4755
4756                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4757                                 is_last = 1;
4758                         } else {
4759                                 iscsit_inc_conn_usage_count(conn_tmp);
4760                                 is_last = 0;
4761                         }
4762                         iscsit_inc_conn_usage_count(conn);
4763
4764                         spin_unlock_bh(&sess->conn_lock);
4765                         iscsit_cause_connection_reinstatement(conn, 1);
4766                         spin_lock_bh(&sess->conn_lock);
4767
4768                         iscsit_dec_conn_usage_count(conn);
4769                         if (is_last == 0)
4770                                 iscsit_dec_conn_usage_count(conn_tmp);
4771                         conn_count--;
4772                 }
4773         } else {
4774                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4775                         iscsit_cause_connection_reinstatement(conn, 0);
4776         }
4777
4778         if (session_sleep && atomic_read(&sess->nconn)) {
4779                 spin_unlock_bh(&sess->conn_lock);
4780                 wait_for_completion(&sess->session_wait_comp);
4781         } else
4782                 spin_unlock_bh(&sess->conn_lock);
4783 }
4784
4785 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4786 {
4787         struct iscsi_session *sess;
4788         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4789         struct se_session *se_sess, *se_sess_tmp;
4790         int session_count = 0;
4791
4792         spin_lock_bh(&se_tpg->session_lock);
4793         if (tpg->nsessions && !force) {
4794                 spin_unlock_bh(&se_tpg->session_lock);
4795                 return -1;
4796         }
4797
4798         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4799                         sess_list) {
4800                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4801
4802                 spin_lock(&sess->conn_lock);
4803                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4804                     atomic_read(&sess->session_logout) ||
4805                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4806                         spin_unlock(&sess->conn_lock);
4807                         continue;
4808                 }
4809                 atomic_set(&sess->session_reinstatement, 1);
4810                 spin_unlock(&sess->conn_lock);
4811                 spin_unlock_bh(&se_tpg->session_lock);
4812
4813                 iscsit_free_session(sess);
4814                 spin_lock_bh(&se_tpg->session_lock);
4815
4816                 session_count++;
4817         }
4818         spin_unlock_bh(&se_tpg->session_lock);
4819
4820         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4821                         " Group: %hu\n", session_count, tpg->tpgt);
4822         return 0;
4823 }
4824
4825 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4826 MODULE_VERSION("4.1.x");
4827 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4828 MODULE_LICENSE("GPL");
4829
4830 module_init(iscsi_target_init_module);
4831 module_exit(iscsi_target_cleanup_module);